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NEET PG 2026 - Complete Topic-Wise Syllabus

Exam Date: August 30, 2026 | Total Questions: 200 MCQs | Duration: 3.5 hours | Conducted by: NBE

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EXAM PATTERN & SUBJECT-WISE WEIGHTAGE

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PART A - PRE-CLINICAL SUBJECTS

1. Anatomy (17 Qs)

• General Anatomy (planes, terms, histology basics)
• Upper Limb - bones, joints, muscles, nerves, vessels
• Lower Limb - bones, joints, muscles, nerves, vessels
• Thorax - heart, lungs, mediastinum
• Abdomen - GI tract, liver, kidneys, peritoneum
• Pelvis & Perineum
• Head & Neck - cranial nerves, skull, orbit, larynx
• Neuroanatomy - brain, spinal cord, tracts
• Embryology - general, organ-specific development
• Histology - tissues, organs

2. Physiology (17 Qs)

• General Physiology (cell, membrane transport)
• Haematology (blood cells, haemostasis, blood groups)
• Nerve & Muscle Physiology (action potential, neuromuscular junction)
• Cardiovascular Physiology (cardiac cycle, output, ECG)
• Respiratory Physiology (lung volumes, gas exchange, control)
• Renal Physiology (GFR, tubular function, acid-base)
• Gastrointestinal Physiology (secretion, motility, absorption)
• Endocrine Physiology (hormones, feedback, diabetes)
• Reproductive Physiology (menstrual cycle, pregnancy)
• Neurophysiology (sensory, motor, reflexes, sleep, EEG)
• Integrated Physiology

3. Biochemistry (16 Qs)

• Basic Biochemistry (pH, buffers, water)
• Enzymes (kinetics, inhibition, regulation)
• Carbohydrate Chemistry & Metabolism (glycolysis, TCA, gluconeogenesis, glycogen)
• Lipid Chemistry & Metabolism (fatty acid oxidation, ketogenesis, lipoproteins)
• Protein Chemistry & Metabolism (amino acids, urea cycle, protein synthesis)
• Metabolism & Homeostasis (integration, starvation, fed state)
• Molecular Biology (DNA replication, transcription, translation, mutations)
• Nutrition (vitamins, minerals, caloric requirements)
• Extracellular Matrix (collagen, proteoglycans)
• Oncogenesis & Immunity (cancer biology, tumor markers)
• Biochemical Laboratory Tests (LFT, RFT, enzyme assays)

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PART B - PARA-CLINICAL SUBJECTS

4. Pathology (25 Qs)

• General Pathology (cell injury, inflammation, repair, neoplasia)
• Haematopathology (anaemias, leukaemias, lymphomas, bleeding disorders)
• Cardiovascular Pathology (IHD, cardiomyopathy, valvular disease)
• Respiratory Pathology (pneumonia, TB, lung tumors, COPD)
• GI Pathology (peptic ulcer, IBD, liver cirrhosis, colorectal cancer)
• Renal Pathology (glomerulonephritis, nephrotic syndrome, renal tumors)
• Endocrine Pathology (thyroid, adrenal, pancreatic diseases)
• Neuropathology (CNS tumors, degenerative diseases, demyelination)
• Bone & Joint Pathology
• Soft Tissue Tumors
• Skin Pathology
• Reproductive Pathology (cervical, endometrial, breast, testicular)
• Infections & Immunopathology

5. Pharmacology (20 Qs)

• General Pharmacology (pharmacokinetics, pharmacodynamics, drug interactions)
• Autonomic Nervous System Drugs (cholinergic, adrenergic, blockers)
• CNS Drugs (sedatives, antiepileptics, antipsychotics, antidepressants, opioids)
• Cardiovascular Drugs (antihypertensives, antiarrhythmics, antianginals, diuretics)
• Respiratory Drugs (bronchodilators, antitussives)
• GI Drugs (antacids, antiemetics, laxatives, IBD drugs)
• Renal Drugs (diuretics, drugs in renal failure)
• Endocrine Drugs (insulin, antidiabetics, thyroid drugs, steroids)
• Antimicrobial Agents (antibiotics, antivirals, antifungals, antiparasitics)
• Anticancer Drugs (alkylating agents, antimetabolites, targeted therapy)
• Immunosuppressants & Immunomodulators
• Drugs in Special Populations (pregnancy, elderly, pediatrics)
• Toxicology (antidotes, drug poisoning)

6. Microbiology (20 Qs)

• General Microbiology (sterilization, culture, staining)
• Bacteriology - Gram positive (Staph, Strep, Clostridium, Bacillus, Listeria)
• Bacteriology - Gram negative (Enterobacteriaceae, Pseudomonas, Vibrio, Helicobacter, Neisseria)
• Mycobacteria (TB, Leprosy)
• Spirochetes (Treponema, Leptospira)
• Atypical organisms (Mycoplasma, Chlamydia, Rickettsia)
• Virology - DNA viruses (Herpes, Poxvirus, Adenovirus, HBV)
• Virology - RNA viruses (HIV, Influenza, Dengue, Rabies, Rotavirus, Measles)
• Mycology (Candida, Aspergillus, Cryptococcus, dermatophytes)
• Parasitology - Protozoology (Plasmodium, Entamoeba, Leishmania, Trypanosoma, Giardia)
• Parasitology - Helminthology (Ascaris, Hookworm, Taenia, Schistosoma, Filaria)
• Immunology (innate/adaptive immunity, hypersensitivity, vaccines, autoimmunity)
• Clinical Microbiology (blood cultures, sensitivity testing)

7. Forensic Medicine (10 Qs)

• Forensic Traumatology (mechanical injuries, regional injuries)
• Forensic Ballistics (firearm injuries)
• Blast & Thermal Injuries
• Transportation Injuries
• Asphyxial Deaths (hanging, strangulation, suffocation, drowning)
• Forensic Thanatology (signs of death, postmortem changes)
• Forensic Identity (human identification, fingerprints, DNA)
• Sexual Jurisprudence (sexual offences, pregnancy, abortion)
• Forensic Toxicology (corrosives, metals, plant/animal poisons, cerebral/cardiac poisons)
• Medical Jurisprudence (legal sections, court procedures, death certification)
• Forensic Psychiatry

8. Social & Preventive Medicine / Community Medicine (25 Qs)

• Epidemiology (study designs, bias, causation, screening)
• Biostatistics (measures of central tendency, tests, sensitivity/specificity)
• Communicable Disease Control (surveillance, immunization, vector control)
• National Health Programs (TB, Malaria, HIV, leprosy, immunization schedules)
• Environmental Health (water, air, waste, occupational health)
• Nutrition (PEM, micronutrient deficiencies, nutrition programs)
• Maternal & Child Health (ANC, MCH programs, ICDS)
• Health Administration & Planning (health systems, policies, NRHM/NHM)
• Demography & Vital Statistics (birth/death rates, census)
• Occupational Health (industrial hazards, pneumoconiosis)
• International Health (WHO, SDGs)

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PART C - CLINICAL SUBJECTS

9. General Medicine (incl. Dermatology, Venereology & Psychiatry) - 45 Qs

• Heart Failure, IHD, Acute MI
• Hypertension
• Pneumonia, COPD, Asthma
• Tuberculosis
• Fever & Febrile Syndromes
• HIV/AIDS
• Liver Disease (hepatitis, cirrhosis)
• GI Bleeding & Diarrheal Disorders
• Acute Kidney Injury & Chronic Renal Failure
• Diabetes Mellitus
• Thyroid Dysfunction
• Anemia (all types)
• Rheumatologic Problems (RA, SLE, gout)
• Common Malignancies
• Cerebrovascular Accident (stroke)
• Movement Disorders (Parkinson's, tremors)
• Headache
• Mineral, Fluid, Electrolyte & Acid-Base Disorders
• Nutritional & Vitamin Deficiencies
• Envenomation & Poisoning
• Geriatrics
• Miscellaneous Infections (Leptospirosis, Rabies, Tetanus)
• Role of physician in community

• Eczema & Dermatitis
• Psoriasis
• Acne & Rosacea
• Skin Infections (bacterial, fungal, viral, parasitic)
• Sexually Transmitted Infections (syphilis, gonorrhoea, herpes, chlamydia)
• Bullous diseases (pemphigus, pemphigoid)
• Skin Tumors (melanoma, BCC, SCC)
• Leprosy (skin manifestations)
• Drug reactions & urticaria
• Disorders of pigmentation

• Schizophrenia & Psychotic disorders
• Mood disorders (depression, mania, bipolar)
• Anxiety disorders (GAD, panic, phobias, OCD, PTSD)
• Substance Use Disorders
• Personality Disorders
• Child Psychiatry (ADHD, autism)
• Dementia & Delirium
• Psychopharmacology
• Legal aspects of psychiatry

10. General Surgery (incl. Orthopaedics, Anaesthesia & Radiodiagnosis) - 45 Qs

• Wound healing & surgical infections
• Shock & fluid management
• Head & Neck surgery (thyroid, parathyroid, salivary glands)
• Breast (cancer, benign lesions)
• Oesophagus, Stomach (peptic ulcer, cancer)
• Small bowel, Appendix (obstruction, appendicitis)
• Colon & Rectum (colorectal cancer, IBD, haemorrhoids)
• Liver, Gallbladder, Bile ducts (cholelithiasis, cholangitis)
• Pancreas (pancreatitis, pancreatic cancer)
• Vascular Surgery (DVT, varicose veins, aneurysms)
• Hernias (inguinal, femoral, umbilical)
• Urology (renal calculi, BPH, bladder/renal cancer, prostate)
• Burns & trauma

• Skeletal Trauma & Polytrauma
• Fractures (types, management, complications)
• Musculoskeletal Infections & Osteomyelitis
• Skeletal Tuberculosis
• Rheumatoid Arthritis & inflammatory disorders
• Degenerative disorders (OA)
• Metabolic Bone Disorders (osteoporosis, rickets)
• Poliomyelitis & Cerebral Palsy
• Bone Tumors
• Peripheral Nerve Injuries
• Congenital Lesions (club foot, CDH)

• Anaesthesiology as a specialty
• Cardiopulmonary Resuscitation (CPR/BLS/ACLS)
• Preoperative evaluation & medication
• General Anaesthesia (agents, stages, equipment)
• Regional Anaesthesia (spinal, epidural, nerve blocks)
• Post-anaesthesia recovery
• Intensive Care Management
• Pain & its management
• Fluids & electrolytes in surgical patients
• Patient safety

• X-ray basics & plain radiography
• Ultrasound (USG principles, common findings)
• CT scan (principles, indications)
• MRI (principles, indications)
• Nuclear medicine & PET scan
• Contrast studies
• Interventional radiology
• Radiation safety & dosimetry

11. Obstetrics & Gynaecology (30 Qs)

• Normal Pregnancy (ANC, physiology, EDD)
• Normal Labour & Puerperium
• Abnormal Labour (malpresentation, dystocia)
• Antepartum Haemorrhage (placenta previa, abruption)
• Postpartum Haemorrhage
• Hypertensive disorders (PIH, pre-eclampsia, eclampsia)
• Medical disorders in pregnancy (anaemia, diabetes, heart disease, infections)
• High-risk pregnancy & IUGR
• Multiple pregnancy
• Preterm labour & PROM
• Obstetric operations (forceps, vacuum, caesarean section)
• Fetal monitoring & CTG
• Neonatology basics

• Menstrual disorders (DUB, amenorrhoea, dysmenorrhoea)
• PCOS
• Infertility
• Contraception
• Endometriosis & Adenomyosis
• PID & STIs
• Fibroids & Polyps
• Ovarian Tumors (benign & malignant)
• Cervical Cancer & Pap smear
• Endometrial Cancer
• Vulvar & Vaginal disorders
• Ectopic Pregnancy
• Abortion
• Prolapse & Urinary incontinence
• Instruments in gynecology & obstetrics

12. Paediatrics (10 Qs)

• Growth & Development (milestones)
• Neonatology (NICU, NNJ, RDS, birth asphyxia, low birth weight)
• Nutrition in children (breastfeeding, weaning, malnutrition)
• Immunization schedules
• Common Infections (measles, pertussis, diphtheria, meningitis)
• Respiratory disorders (croup, bronchiolitis, pneumonia)
• Cardiovascular (congenital heart diseases - ASD, VSD, TOF, PDA)
• GI disorders (diarrhoea, dehydration, GERD)
• Renal (nephrotic syndrome, UTI)
• Neurological (febrile seizures, meningitis, cerebral palsy)
• Endocrine & Metabolic (hypothyroidism, CAH, IEM)
• Haematological (anaemia, thalassaemia, haemophilia)
• Paediatric malignancies (ALL, Wilms' tumor, neuroblastoma)
• Genetic disorders (Down syndrome, Turner, Klinefelter)

13. ENT - Ear, Nose & Throat (10 Qs)

• Anatomy & Physiology of ear, nose, throat, head & neck
• Ear - Otitis media (acute & chronic), otosclerosis, cholesteatoma
• Ear - Hearing loss, tinnitus, vertigo (BPPV, Meniere's)
• Nose - Epistaxis, rhinitis, sinusitis, nasal polyps
• Nose - Deviated nasal septum
• Throat - Tonsillitis, pharyngitis, peritonsillar abscess
• Larynx - Hoarseness, laryngitis, laryngeal cancer
• Head & Neck - Neck masses, parotid tumors, thyroglossal cyst
• Sleep apnoea
• Audiometry & hearing tests
• Diagnostic & therapeutic procedures (myringotomy, FESS, tracheostomy)

14. Ophthalmology (10 Qs)

• Anatomy of the eye
• Errors of refraction (myopia, hypermetropia, astigmatism, presbyopia)
• Conjunctivitis (bacterial, viral, allergic)
• Corneal diseases (keratitis, corneal ulcer)
• Glaucoma (open-angle, closed-angle, congenital)
• Cataract
• Retinal diseases (diabetic retinopathy, ARMD, retinal detachment)
• Uveitis & inflammatory conditions
• Strabismus & amblyopia
• Optic nerve disorders (papilloedema, optic neuritis)
• Lid & Lacrimal apparatus (chalazion, entropion, ectropion, dacryocystitis)
• Ocular trauma
• Investigations (slit-lamp, fundus exam, visual field testing)
• Ocular pharmacology

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QUICK PREPARATION TIPS

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Note: NBE does not release a strict chapter-wise syllabus. The above is based on the MCI/NMC MBBS curriculum and analysis of previous year NEET PG papers. The official syllabus can be verified at natboard.edu.in. The exam covers the entire MBBS curriculum, so depth matters as much as breadth.

1. Anatomical planes, terms & surface landmarks
2. Body cavities & abdominal regions
3. Bones & osteology (classification, structure, ossification)
4. Joints - all types with examples (synovial joint classification table)
5. Muscles - fiber types, pennation, architecture
6. Cardiovascular system - vessel types & structure
7. Lymphatic system - drainage routes (high yield)
8. General neuroanatomy - nerve fibers, ANS comparison
9. General embryology - germ layers, Carnegie stages, aortic arches
10. Skin - layers, cell types, sensory receptors

• CRITOE mnemonic (elbow ossification)
• Transpyloric plane contents (L1)
• Neural crest derivatives
• Aortic arch development
• ANS neurotransmitters (sweat gland exception)
• Lymph node zones (B vs T cell areas)
• Local anesthetic fiber block order

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GENERAL ANATOMY - Medical Terms & Hard Words Explained

Every difficult word, root, prefix & suffix - simplified for NEET PG

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PART 1: WORD ROOTS, PREFIXES & SUFFIXES

Prefixes - Direction & Position

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Suffixes - What Happens to a Structure

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Key Root Words (Body Structures)

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PART 2: ANATOMICAL TERMS EXPLAINED SIMPLY

A

• Mnemonic: Afferent = Approaching

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B

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C

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D

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E

• Mnemonic: Efferent = Exiting

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F

• Anterior fontanelle (largest): Closes at 18 months - 2 years
• Posterior fontanelle: Closes at 2-3 months

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G

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H

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I

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J

1. Outer fibrous layer (thick, provides stability)
2. Inner synovial membrane (produces synovial fluid) Like a rubber sleeve around a joint.

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K

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L

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M

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N

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O

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P

1. Outer fibrous layer (dense connective tissue)
2. Inner osteogenic layer (contains osteoprogenitor cells and osteoblasts) Essential for bone repair and growth in width (appositional growth). "Peri" = around + "osteon" = bone.

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R

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S

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T

• Tunica intima = innermost layer
• Tunica media = middle layer
• Tunica adventitia = outermost layer

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V

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W

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PART 3: QUICK-REFERENCE MNEMONICS FOR HARD TERMS

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PART 4: CONFUSING WORD PAIRS - EXPLAINED

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These notes cover every major hard word and medical term in the General Anatomy NEET PG syllabus. Understanding word roots lets you figure out unfamiliar terms in the exam without having memorized them - a powerful strategy for MCQs.

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GENERAL ANATOMY - DIAGRAM NOTES (NEET PG)

Visual learning for every topic

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CHAPTER 1: ANATOMICAL PLANES & TERMS

DIAGRAM 1.1 - The 3 Main Planes of the Body

                    SUPERIOR (Head)
                         ▲
                         │
         ┌───────────────┼───────────────┐
         │               │               │
         │    SAGITTAL   │   CORONAL     │
         │    PLANE      │   PLANE       │
         │  (Left/Right) │ (Front/Back)  │
         │               │               │
    ◄────┼───────────────┼───────────────┼────►
  POST   │               │               │   ANT
  ERIOR  │         TRANSVERSE PLANE      │   ERIOR
         │         (Superior/Inferior)   │
         │               │               │
         └───────────────┼───────────────┘
                         │
                         ▼
                    INFERIOR (Feet)

┌─────────────────────────────────────────────┐
│  PLANE         DIVIDES INTO    DIRECTION    │
│  ─────────────────────────────────────────  │
│  Sagittal      L & R halves    ↕ Vertical   │
│  Coronal       Front & Back    ↕ Vertical   │
│  Transverse    Top & Bottom    ↔ Horizontal │
└─────────────────────────────────────────────┘

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DIAGRAM 1.2 - Anatomical Directions (Body Map)

                 SUPERIOR
                    ▲
                    │
                  HEAD
              ┌────┴────┐
              │  MEDIAL │◄──── toward midline
     LATERAL  │  ←──→  │      away from midline ────► LATERAL
              │         │
              │  TRUNK  │
              │         │
   ANTERIOR ──►         ◄── POSTERIOR
   (Front)    │         │       (Back)
              │         │
              └────┬────┘
                   │
                LIMBS
         PROXIMAL (near trunk)
                ┌───┐
                │   │
                │   │  ← Thigh / Upper arm
                │   │
                ├───┤
                │   │  ← Leg / Forearm
                │   │
                └───┘
         DISTAL (far from trunk)
                   │
                   ▼
                INFERIOR

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DIAGRAM 1.3 - Clinical Planes with Vertebral Levels

      ANTERIOR VIEW OF ABDOMEN

 Xiphisternum (T9) ─────────────────
                    ┌─────────────┐
 Transpyloric ──────┤     L1      ├──── Pylorus, GB fundus,
 Plane              └─────────────┘     Neck of pancreas,
                                        Hilum of kidney
                    ┌─────────────┐
 Subcostal ─────────┤     L3      ├──── 10th costal cartilage
 Plane              └─────────────┘
                    ┌─────────────┐
 Supracrestal ──────┤     L4      ├──── ILIAC CRESTS ← LP here!
 Plane              └─────────────┘
                    ┌─────────────┐
 Intertubercular ───┤     L5      ├──── Iliac tubercles
 Plane              └─────────────┘
 Pubic symphysis ─────────────────

 ⭐ KEY: L1 = Transpyloric | L4 = Supracrestal (LP)

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CHAPTER 2: BODY CAVITIES & REGIONS

DIAGRAM 2.1 - Body Cavities

         BODY CAVITIES
               │
     ┌─────────┴──────────┐
     │                    │
  DORSAL               VENTRAL
  CAVITY               CAVITY
     │                    │
  ┌──┴──┐         ┌───────┴────────┐
  │     │         │                │
CRANIAL SPINAL  THORACIC        ABDOMINOPELVIC
(Brain)(Cord)   CAVITY          CAVITY
                  │               │
              ┌───┴───┐       ┌───┴───┐
           PLEURAL PERI-   ABDOMINAL PELVIC
           (×2)  CARDIAL

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DIAGRAM 2.2 - 9 Abdominal Regions

    ┌──────────────┬──────────────┬──────────────┐
    │  R.HYPO-     │  EPIGASTRIC  │  L.HYPO-     │
    │  CHONDRIAC   │              │  CHONDRIAC   │
    │  Liver(R)    │ Stomach,Liver│  Spleen      │
    │  Gallbladder │ Duodenum,    │  Stomach(F)  │
    │  Hep.flexure │ Pancreas(H)  │  Spl.flexure │
    ├──────────────┼──────────────┼──────────────┤
    │  R.LUMBAR    │  UMBILICAL   │  L.LUMBAR    │
    │  (Lateral)   │              │  (Lateral)   │
    │  Ascending   │ Trans.colon  │  Descending  │
    │  colon       │ Jejunum/Ileum│  colon       │
    │  R.Kidney(L) │ Aorta bifurc.│  L.Kidney(L) │
    ├──────────────┼──────────────┼──────────────┤
    │  R.ILIAC     │  HYPOGASTRIC │  L.ILIAC     │
    │  (Inguinal)  │  (Pubic)     │  (Inguinal)  │
    │  Caecum      │  Bladder     │  Sigmoid     │
    │  Appendix    │  Uterus      │  colon       │
    │  R.Ureter    │  Sigmoid(L)  │  L.Ureter    │
    └──────────────┴──────────────┴──────────────┘
    (F) = fundus  (H) = head  (L) = lower pole

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CHAPTER 3: BONES & OSTEOLOGY

DIAGRAM 3.1 - Parts of a Long Bone

           ┌─────────────────┐
           │  EPIPHYSIS (End)│  ← Secondary ossification centre
           │  Articular      │  ← Hyaline cartilage (no BV/nerve)
           │  Cartilage      │
           ├─────────────────┤
           │  EPIPHYSEAL     │  ← Growth plate (hyaline cartilage)
           │  PLATE          │  ← Closes at puberty → synostosis
           ├─────────────────┤
           │                 │
           │  METAPHYSIS     │  ← Most vascular region
           │  (flared zone)  │  ← Osteosarcoma commonest here
           │                 │
           ├─────────────────┤
           │                 │
           │                 │  ← Compact (cortical) bone
           │   DIAPHYSIS     │     outside
           │    (Shaft)      │
           │  ┌───────────┐  │  ← Medullary cavity (bone marrow)
           │  │  MEDULLARY│  │     inside
           │  │  CAVITY   │  │
           │  └───────────┘  │
           │                 │
           ├─────────────────┤
           │  METAPHYSIS     │
           ├─────────────────┤
           │  EPIPHYSEAL     │
           │  PLATE          │
           ├─────────────────┤
           │  EPIPHYSIS      │
           └─────────────────┘

  OUTER COVERINGS:
  Periosteum ──► covers outside of diaphysis
  Endosteum  ──► lines inside of medullary cavity

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DIAGRAM 3.2 - Bone Cell Hierarchy

   MESENCHYMAL STEM CELL
           │
           ▼
   OSTEOPROGENITOR CELL  ──► (in periosteum & endosteum)
           │
           ▼
      OSTEOBLAST  ──► BUILDS bone (secretes osteoid)
           │
           │ (gets surrounded by matrix)
           ▼
      OSTEOCYTE   ──► MAINTAINS bone (in lacunae)
                       communicates via canaliculi

   MONOCYTE/MACROPHAGE
           │
           ▼
      OSTEOCLAST  ──► DESTROYS bone (in Howship's lacuna)
                       multinucleated, uses HCl + cathepsin K

  ┌────────────────────────────────────────────┐
  │  MEMORY: OsteoBlast = Build | osteoCLAST  │
  │  = Crush (like iconoclast = image crusher) │
  └────────────────────────────────────────────┘

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DIAGRAM 3.3 - Compact Bone Structure (Osteon)

         COMPACT BONE CROSS-SECTION
    ┌──────────────────────────────────────┐
    │                                      │
    │   Concentric lamellae                │
    │        ○ ← Osteocyte in lacuna       │
    │      ╔═══╗                           │
    │    ╔═╣ ● ╠═╗   ● = Haversian canal  │
    │   ╔╣ ╚═══╝ ╠╗      (blood vessel)   │
    │  ╔╣ ╔═════╗ ╠╗                      │
    │  ╚══╝ ║ ║ ╚══╝                      │
    │       ║ ║  ← Volkmann's canal        │
    │       ║ ║    (transverse, connects   │
    │       ║ ║     Haversian canals)      │
    │                                      │
    │  Periosteum                          │
    │  ─────────  outer fibrous layer      │
    │  ─────────  inner osteogenic layer   │
    └──────────────────────────────────────┘

  HAVERSIAN CANAL = longitudinal (along bone axis)
  VOLKMANN'S CANAL = transverse (across bone axis)

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DIAGRAM 3.4 - Types of Ossification

  INTRAMEMBRANOUS                ENDOCHONDRAL
  (Direct)                       (Indirect)
  ─────────────                  ─────────────
  Mesenchyme                     Mesenchyme
      │                               │
      │  NO cartilage                 │ forms
      │  intermediate                 ▼
      ▼                         Hyaline cartilage
    BONE                        model (template)
                                       │
                                       │ replaced by
                                       ▼
                                      BONE

  Examples:                     Examples:
  • Flat bones of SKULL         • Long bones
  • Mandible                    • Vertebrae, Ribs
  • CLAVICLE (also partly)      • Base of skull
  • Maxilla                     • Most bones

  ⭐ CLAVICLE = BOTH types (unique long bone!)

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DIAGRAM 3.5 - CRITOE Elbow Ossification

  ELBOW OSSIFICATION CENTERS (in order of appearance)

  C ──► Capitulum           1 year
  R ──► Radial head         3 years
  I ──► Internal (medial)   5 years
        epicondyle
  T ──► Trochlea            9 years
  O ──► Olecranon           9 years
  E ──► External (lateral) 11 years
        epicondyle

        Lateral epicondyle
              │
    ┌─────────┴─────────┐
    │   HUMERUS         │
    │     T    C        │  ← Trochlea(T) medial
    │       \/          │    Capitulum(C) lateral
    │   O ──┤├── R      │  ← Olecranon(O) posterior
    │  (ulna)│  (radius)│    Radial head(R) lateral
    │        │          │
    │   I (medial epi.) │
    └───────────────────┘

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CHAPTER 4: JOINTS

DIAGRAM 4.1 - Classification of Joints Tree

                    JOINTS
                      │
      ┌───────────────┼────────────────┐
      │               │                │
  FIBROUS         CARTILAGINOUS     SYNOVIAL
  (Synarthrosis)  (Amphiarthrosis)  (Diarthrosis)
  IMMOVABLE       SLIGHTLY MOVABLE  FREELY MOVABLE
      │               │                │
   ┌──┼──┐        ┌───┴───┐       6 types (below)
   │  │  │        │       │
Suture Synd- Gom- Primary Secondary
      esmosis phosis (Synchon- (Symphysis)
                    drosis)
                    HYALINE   FIBRO-
                    CARTILAGE CARTILAGE

 Examples:        Examples:      Examples:
 Skull sutures    Epiphyseal     Hip, Knee,
 Interosseous     plates,        Shoulder,
 membrane         Pub.symphysis  Wrist...
 Teeth in sockets Intervert.disc

---

DIAGRAM 4.2 - Structure of a Synovial Joint

                  BONE
                   │
    Periosteum ────┘
                ┌──────────────────┐
                │   Fibrous        │◄── Joint capsule
                │   capsule        │    (outer layer)
                │  ┌────────────┐  │
                │  │ Synovial   │  │◄── Synovial membrane
                │  │ membrane   │  │    (inner layer, produces fluid)
    Articular ──►  │            │  │
    cartilage   │  │  JOINT     │  │
    (hyaline)   │  │  CAVITY    │  │◄── Contains synovial fluid
                │  │  ════════  │  │
                │  │  Synovial  │  │◄── Lubricates + nourishes
                │  │  fluid     │  │    cartilage
                │  └────────────┘  │
                │                  │
                └──────────────────┘
                         │
                       BONE

  ⭐ Articular cartilage = HYALINE (except TMJ & sternoclavicular
                                    = FIBROCARTILAGE)
  ⭐ NO blood vessels, nerves, lymphatics in articular cartilage

---

DIAGRAM 4.3 - 6 Types of Synovial Joints

 ┌────────────┬────────────┬──────────────┬──────────────┐
 │   TYPE     │  SHAPE     │  MOVEMENT    │  EXAMPLE     │
 ├────────────┼────────────┼──────────────┼──────────────┤
 │  HINGE     │  ═══╗      │  F/E only    │  Elbow, IP   │
 │            │  ═══╝      │  1 axis      │  joints      │
 ├────────────┼────────────┼──────────────┼──────────────┤
 │  PIVOT     │   ─○─      │  Rotation    │  Atlas-axis  │
 │            │   ─│─      │  only 1 axis │  Radio-ulnar │
 ├────────────┼────────────┼──────────────┼──────────────┤
 │ CONDYLOID  │   ┌─┐      │  F/E+Ab/Ad   │  Wrist       │
 │ (Ellipsoid)│  (oval)    │  2 axes      │  MCP joints  │
 ├────────────┼────────────┼──────────────┼──────────────┤
 │  SADDLE    │  ╔═╗╔═╗   │  F/E+Ab/Ad   │  1st CMC     │
 │            │  ╚═╝╚═╝   │  2 axes      │  (thumb)     │
 ├────────────┼────────────┼──────────────┼──────────────┤
 │  BALL &    │   (●)      │  All         │  Hip,        │
 │  SOCKET    │   ╰─╯      │  3 axes      │  Shoulder    │
 ├────────────┼────────────┼──────────────┼──────────────┤
 │  PLANE     │  ▬▬▬       │  Gliding     │  Intercarpal │
 │  (Gliding) │  ▬▬▬       │  multi-dir.  │  Facet jts   │
 └────────────┴────────────┴──────────────┴──────────────┘

 MOST MOBILE  = Shoulder (Ball & socket)
 MOST STABLE  = Hip (Ball & socket, deep socket)
 MOST COMPLEX = Knee (Modified hinge + rotation)

---

DIAGRAM 4.4 - Joint Movements Summary

         FLEXION                EXTENSION
         (angle ↓)              (angle ↑)
         ────────               ─────────
           bend                  straighten

    ABDUCTION            ADDUCTION
    (away from midline)  (toward midline)
    ───────────────────  ─────────────────
        arm out              arm in

    MEDIAL ROTATION      LATERAL ROTATION
    (inward spin)        (outward spin)

    PRONATION            SUPINATION
    (palm back/down)     (palm front/up)
    ────────────────     ───────────────
    Mnemonic: SUPination = hold a SOUP bowl

    INVERSION            EVERSION
    (sole IN/medial)     (sole OUT/lateral)
    ────────────────     ──────────────────
    Mnemonic: INversion = sole INward

    CIRCUMDUCTION = circular movement
    (F + E + Ab + Ad combined = cone shape)

---

CHAPTER 5: MUSCLES

DIAGRAM 5.1 - Connective Tissue Layers of Muscle

           WHOLE MUSCLE
    ┌─────────────────────────────┐
    │  EPIMYSIUM                  │◄── covers ENTIRE muscle
    │  ┌───────────────────────┐  │
    │  │  PERIMYSIUM           │  │◄── covers FASCICLE
    │  │  ┌─────────────────┐  │  │         (bundle)
    │  │  │  ENDOMYSIUM     │  │  │◄── covers SINGLE
    │  │  │  ┌───────────┐  │  │  │         muscle FIBER
    │  │  │  │  MUSCLE   │  │  │  │
    │  │  │  │  FIBER    │  │  │  │
    │  │  │  │  (cell)   │  │  │  │
    │  │  │  └───────────┘  │  │  │
    │  │  └─────────────────┘  │  │
    │  └───────────────────────┘  │
    └─────────────────────────────┘

  SAME PATTERN for NERVE:
  Epineurium  → whole nerve
  Perineurium → fascicle (nerve fiber bundle)
  Endoneurium → single axon

  MEMORY: Epi=Entire, Peri=Part(fascicle), Endo=Each fiber

---

DIAGRAM 5.2 - Muscle Fiber Types Comparison

  ┌──────────────────────────────────────────────────────┐
  │           TYPE I             │         TYPE II        │
  │     (SLOW, RED, Postural)    │  (FAST, WHITE, Phasic) │
  ├──────────────────────────────┼────────────────────────┤
  │  Speed: SLOW                 │  Speed: FAST           │
  │  Metabolism: OXIDATIVE ○₂   │  Metabolism: GLYCOLYTIC│
  │  Fatigue: RESISTANT          │  Fatigue: EASILY       │
  │  Myoglobin: HIGH (red)       │  Myoglobin: LOW (pale) │
  │  Mitochondria: MANY          │  Mitochondria: FEW     │
  │  Function: Endurance/posture │  Function: Power/speed │
  │  Athletes: Marathon runners  │  Athletes: Sprinters   │
  │  Example: Soleus, erector    │  Example: Extraocular  │
  │           spinae             │           muscles      │
  └──────────────────────────────┴────────────────────────┘

---

DIAGRAM 5.3 - Types of Muscle Pennation

  PARALLEL/STRAP    FUSIFORM      UNIPENNATE
  (Sartorius)       (Biceps)      (FPL)

  │││││││           │   │       ///│
  │││││││          /│   │\     /// │
  │││││││         / │   │ \   ///  │
  │││││││          \│   │/   ///   │
  │││││││           │   │   ///    │
  TENDON           TENDON  TENDON

  Fibers parallel   Tapered   Fibers one side

  BIPENNATE         MULTIPENNATE
  (Rectus femoris)  (Deltoid)

  \\│//            \\/│/\\
   \│/              \/│\/
   /│\              /\│/\
  //│\\            //\│/\\
  TENDON           TENDON

  Fibers both sides  Multiple angles

  MORE PENNATION = MORE FORCE, LESS RANGE

---

DIAGRAM 5.4 - Muscle Action Roles

  MOVEMENT: Flexing the elbow (example)

  ┌─────────────────────────────────────────┐
  │  AGONIST (Prime Mover)                  │
  │  Biceps brachii ──► performs flexion    │
  │                                         │
  │  ANTAGONIST                             │
  │  Triceps brachii ──► opposes flexion    │
  │  (relaxes during movement)              │
  │                                         │
  │  SYNERGIST                              │
  │  Brachialis ──► assists biceps          │
  │  Brachioradialis ──► assists + stabilizes│
  │                                         │
  │  FIXATOR (Stabilizer)                   │
  │  Rotator cuff muscles ──► fix shoulder  │
  │  so biceps can pull on radius           │
  └─────────────────────────────────────────┘

---

CHAPTER 6: CARDIOVASCULAR SYSTEM

DIAGRAM 6.1 - Blood Circulation Circuits

                    ┌───────────────────┐
                    │      LUNGS        │ (oxygenation)
                    │  O₂ in, CO₂ out  │
                    └────────┬──────────┘
                    ↑        │
              Pulmonary      │ Pulmonary
              artery         │ veins
              (deoxygenated) │ (oxygenated)
                    │        ▼
           ┌────────────────────────────┐
           │    RIGHT    │    LEFT      │
           │    HEART    │    HEART     │
           │  RA → RV    │  LA → LV    │
           └────────┬───────────────┬──┘
                    │               │
              Systemic             Aorta
              veins                │
                    ↑               ▼
                    └───────────────┘
                         BODY
                    (O₂ delivery, CO₂ pickup)

  PORTAL CIRCULATION:
  Gut capillaries → Portal vein → Liver sinusoids
       → Hepatic veins → IVC → Heart
  (Two capillary beds in series)

---

DIAGRAM 6.2 - Blood Vessel Wall Layers

              ARTERY               VEIN
         ┌──────────────┐    ┌──────────────┐
  Tunica │  Adventitia  │    │  Adventitia  │← THICK in veins
  ───────┤──────────────┤    ├──────────────┤
  Tunica │  MEDIA       │    │  media       │← thin in veins
  ───────┤  (thick SM   │    ├──────────────┤
         │  + elastic)  │    │  intima      │◄── VALVES here
  Tunica ├──────────────┤    ├──────────────┤    (veins only)
  ───────│  Intima      │    │  intima      │
         │  (endothelium│    │  (endothelium│
         │  + IEL)      │    │  + thin)     │
         └──────────────┘    └──────────────┘
         Small lumen          Large lumen
         Thick wall           Thin wall

  IEL = Internal elastic lamina (between intima & media)
  EEL = External elastic lamina (between media & adventitia)

---

DIAGRAM 6.3 - Types of Blood Vessels

  AORTA           ARTERIOLES        CAPILLARIES
  (Elastic)       (Resistance)      (Exchange)
     │                │                 │
  Absorbs          Controls          O₂, CO₂,
  systolic         BP &              nutrients,
  pressure         blood flow        waste
  (Windkessel      distribution      exchange
  effect)
     │                │                 │
  ────────────────────────────────────────────►
  HEART → Elastic → Muscular → Arterioles → Capillaries
  arteries   arteries                         │
                                          Venules
                                              │
                                    Veins (Capacitance)
                                    store 60-80% blood
                                              │
                                           HEART

---

CHAPTER 7: LYMPHATIC SYSTEM

DIAGRAM 7.1 - Lymph Node Structure

         AFFERENT VESSELS (many)
         ↓  ↓  ↓  ↓  ↓
    ┌──────────────────────────┐
    │      CAPSULE             │
    │  ┌──────────────────┐   │
    │  │   CORTEX         │   │
    │  │  ┌────────────┐  │   │← B-cell zone
    │  │  │ Secondary  │  │   │  (germinal
    │  │  │ follicle   │  │   │   centres)
    │  │  │(germinal   │  │   │
    │  │  │ centre)    │  │   │
    │  │  └────────────┘  │   │
    │  ├──────────────────┤   │
    │  │  PARACORTEX      │   │← T-cell zone
    │  │  (HEV here)      │   │  Lymphocytes
    │  │  ←lymphocytes    │   │  enter via HEV
    │  │    enter blood   │   │
    │  ├──────────────────┤   │
    │  │  MEDULLA         │   │
    │  │  Medullary cords │   │← Plasma cells
    │  │  Medullary       │   │  Macrophages
    │  │  sinuses         │   │
    │  └──────────────────┘   │
    │         HILUM            │
    └──────────────────────────┘
              ↓
         EFFERENT VESSEL (ONE only)

  REMEMBER: Many afferent IN, ONE efferent OUT at hilum

---

DIAGRAM 7.2 - Lymphatic Drainage Map

         HEAD & NECK              BODY
              │                     │
    ┌─────────┴─────────┐           │
    │                   │           │
  RIGHT SIDE         LEFT SIDE      │
    │                   │           │
    ▼                   ▼           ▼
  RIGHT              THORACIC    THORACIC
  LYMPHATIC          DUCT        DUCT
  DUCT               (left)      drains ALL
                                 of these too:
    ▼                   │        • Left side H&N
  Right               drains     • Left upper limb
  subclavian          ~75% of    • Both lower limbs
  + R.int.jugular     body       • Abdomen/Pelvis
  junction                       • Right lower body

  RIGHT LYMPHATIC DUCT = Right upper quadrant ONLY
  ┌──────────────────────────────────────────────────┐
  │  ORGAN         DRAINS TO                         │
  │  Testes   ──►  Para-aortic (lumbar) nodes        │
  │  Scrotum  ──►  Superficial inguinal nodes        │
  │  Fundus   ──►  Para-aortic nodes                 │
  │  Uterus   ──►  Iliac nodes                       │
  └──────────────────────────────────────────────────┘

---

CHAPTER 8: NERVOUS SYSTEM

DIAGRAM 8.1 - Nervous System Overview

              NERVOUS SYSTEM
                    │
        ┌───────────┴───────────┐
        │                       │
       CNS                     PNS
  Brain + Spinal cord      All other nerves
        │                       │
   ┌────┴────┐           ┌──────┴──────┐
   │         │           │             │
BRAIN    SPINAL        SOMATIC      AUTONOMIC
         CORD           │               │
                   ┌────┴────┐    ┌─────┴─────┐
                   │         │    │     │     │
                SENSORY   MOTOR SYMPA- PARA-  ENTERIC
                (afferent) (efferent) THETIC SYMPA- (gut)
                toward    away         │    THETIC
                CNS       CNS     fight/    rest/
                                  flight    digest

---

DIAGRAM 8.2 - Nerve Fiber Types (Speed & Size)

  LARGEST → FASTEST              SMALLEST → SLOWEST

  Aα  ──────────────────────     Diameter: 12-20 μm
  (Somatic motor + propriocep.)  Speed: 70-120 m/s

  Aβ  ────────────────────       Diameter: 6-12 μm
  (Touch, pressure)              Speed: 30-70 m/s

  Aγ  ──────────────────         Diameter: 3-6 μm
  (Muscle spindle motor)         Speed: 15-30 m/s

  Aδ  ────────────────           Diameter: 1-5 μm
  (Sharp pain, cold temp)        Speed: 5-30 m/s

  B   ───────────                Diameter: <3 μm
  (Preganglionic autonomic)      Speed: 3-15 m/s

  C   ─────                      Diameter: 0.2-1.5 μm
  (Slow pain, warm, postganglio) Speed: 0.5-2 m/s
  UNMYELINATED

  LOCAL ANAESTHETIC BLOCK ORDER:
  C blocked first (pain relief) → ... → Aα blocked last
  "Pain goes before power"

---

DIAGRAM 8.3 - Autonomic Nervous System Comparison

 ┌──────────────────────────────────────────────────────┐
 │              SYMPATHETIC     │   PARASYMPATHETIC     │
 ├──────────────────────────────┼───────────────────────┤
 │ Origin:    Thoracolumbar     │   Craniosacral        │
 │            T1-L2             │   CN3,7,9,10 + S2-S4  │
 ├──────────────────────────────┼───────────────────────┤
 │ Preganglionic: SHORT         │   LONG                │
 │ Postganglionic: LONG         │   SHORT               │
 ├──────────────────────────────┼───────────────────────┤
 │ Ganglion:  PARAVERTEBRAL     │   Near/IN target organ│
 │            chain/prevertebral│                       │
 ├──────────────────────────────┼───────────────────────┤
 │ Pre-NT:    ACh (nicotinic)   │   ACh (nicotinic)     │
 │ Post-NT:   NORADRENALINE     │   ACh (MUSCARINIC)    │
 │            (adrenergic)      │                       │
 ├──────────────────────────────┼───────────────────────┤
 │ EFFECTS:   FIGHT/FLIGHT      │   REST/DIGEST         │
 │  Heart:    ↑HR, ↑contractile │   ↓HR                 │
 │  Pupil:    MYDRIASIS (dilate)│   MIOSIS (constrict)  │
 │  Bronchi:  DILATE            │   CONSTRICT           │
 │  Gut:      ↓ motility        │   ↑ motility          │
 │  Bladder:  RELAX (fill)      │   CONTRACT (empty)    │
 └──────────────────────────────┴───────────────────────┘

 ⭐ EXCEPTION: Sweat glands = SYMPATHETIC but uses ACh!

---

DIAGRAM 8.4 - Nerve Fiber Coverings (Nerve vs Muscle)

  NERVE TRUNK                   MUSCLE

  ┌─────────────────────┐      ┌──────────────────────┐
  │  EPINEURIUM         │      │  EPIMYSIUM            │
  │  ┌───────────────┐  │      │  ┌────────────────┐   │
  │  │  PERINEURIUM  │  │      │  │  PERIMYSIUM    │   │
  │  │  ┌─────────┐  │  │      │  │  ┌──────────┐  │   │
  │  │  │ENDONEU- │  │  │      │  │  │ENDOMYSIUM│  │   │
  │  │  │RIUM     │  │  │      │  │  │ ┌──────┐ │  │   │
  │  │  │ ┌─────┐ │  │  │      │  │  │ │FIBER │ │  │   │
  │  │  │ │AXON │ │  │  │      │  │  │ │(cell)│ │  │   │
  │  │  │ └─────┘ │  │  │      │  │  │ └──────┘ │  │   │
  │  │  └─────────┘  │  │      │  │  └──────────┘  │   │
  │  └───────────────┘  │      │  └────────────────┘   │
  └─────────────────────┘      └──────────────────────┘
  Fascicle = nerve fiber bundle  Fascicle = muscle fiber bundle

---

CHAPTER 9: EMBRYOLOGY

DIAGRAM 9.1 - Early Development Timeline

  FERTILIZATION
       │ Day 0
       ▼
    ZYGOTE (1 cell)
       │ Day 1-3
       ▼
    MORULA (mulberry, ~16 cells)
       │ Day 4
       ▼
    BLASTOCYST (hollow ball)
       │ Day 6-7
       ▼
    IMPLANTATION (endometrium)
       │ Week 2
       ▼
    BILAMINAR DISC (Epiblast + Hypoblast)
       │ Week 3
       ▼
    TRILAMINAR DISC (Gastrulation)
    ┌──────┬──────┬───────┐
 ECTODERM MESODERM ENDODERM
       │ Week 3-4
       ▼
    NEURULATION (neural tube forms)
       │ Week 4 onward
       ▼
    ORGANOGENESIS (all major organs begin)
       │ Week 8
       ▼
    END OF EMBRYONIC PERIOD → FETAL PERIOD

---

DIAGRAM 9.2 - Germ Layer Derivatives

              TRILAMINAR DISC
     ┌────────────┬────────────┬────────────┐
     │            │            │            │
  ECTODERM    MESODERM     ENDODERM    NEURAL CREST
  (Outer)     (Middle)     (Inner)     (Special)
     │            │            │            │
  • Skin        • Muscle     • GI lining  • Periph.
  • CNS         • Bone       • Resp. epith  ganglia
  • Sense       • Connective • Liver      • Schwann
    organs        tissue     • Pancreas     cells
  • Ant.        • Heart      • Thyroid    • Adrenal
    pituitary   • Kidney       (follicles)  medulla
  • Lens        • Gonads     • Parathyroid• Melanocytes
  • Enamel      • Adrenal    • Bladder    • Face
    of teeth      CORTEX     • Thymus       cartilage/
  • Hair, nails • Dermis     • Eustachian   bone
  • Sweat         (trunk)      tube       • C-cells of
    glands      • Spleen     • Tympanic     thyroid
                              cavity

  KEY POINT:
  Adrenal CORTEX = MESODERM
  Adrenal MEDULLA = NEURAL CREST (ectoderm)

---

DIAGRAM 9.3 - Aortic Arch Development

  EMBRYO has 6 paired aortic arches (not all at once)

  Arch 1 ──► REGRESSES (small part → maxillary a.)
  Arch 2 ──► REGRESSES (small part → stapedial a.)
  Arch 3 ──► COMMON CAROTID + proximal INTERNAL CAROTID

                  ┌───── Arch 4 LEFT ──────► AORTIC ARCH
  Arch 4 ──────── │
                  └───── Arch 4 RIGHT ─────► Proximal R.SUBCLAVIAN

  Arch 5 ──► COMPLETELY REGRESSES (no derivatives)

                  ┌───── Arch 6 LEFT ──────► L.PULMONARY A.
  Arch 6 ──────── │                          + DUCTUS ARTERIOSUS
                  └───── Arch 6 RIGHT ─────► R.PULMONARY A.

  ⭐ DUCTUS ARTERIOSUS = 6th LEFT arch
  ⭐ LIGAMENTUM ARTERIOSUM = adult remnant of ductus arteriosus
  ⭐ AORTIC ARCH = 4th LEFT arch

  MNEMONIC: "3 carotid, 4 aortic, 6 pulmonary"

---

DIAGRAM 9.4 - Neural Tube Closure

    WEEK 3-4: NEURULATION

       NEURAL PLATE forms
            ↓
       Neural folds rise up
        /──────\
       /  Neural \
      │   groove  │
       \         /
        \───────/
            ↓
       Folds fuse at MIDLINE (zipper closing)

    Rostral (head) end closes → Day 25
    Caudal (tail) end closes  → Day 27

    ┌─────────────────────────────────────────┐
    │  FAILURE of closure:                    │
    │  Rostral neuropore fails → ANENCEPHALY  │
    │  Caudal neuropore fails  → SPINA BIFIDA │
    └─────────────────────────────────────────┘

    NEURAL CREST cells migrate away from dorsal
    neural tube edges as it closes:
    → Peripheral ganglia, melanocytes, adrenal
      medulla, face cartilage, Schwann cells...

---

CHAPTER 10: SKIN

DIAGRAM 10.1 - Layers of the Skin

  SURFACE (outside)
       │
  ─────────────────────────────  Stratum CORNEUM
  ░░░░░░░░░░░░░░░░░░░░░░░░░░░  (Dead, flat, keratin)
  ─────────────────────────────  Stratum LUCIDUM
  ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓  (Only in thick skin:
  ─────────────────────────────   palms & soles)
  ◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆  Stratum GRANULOSUM
  ─────────────────────────────  (Keratohyalin granules)
  ●─●─●─●─●─●─●─●─●─●─●─●─●─  Stratum SPINOSUM
  ─────────────────────────────  (Prickle cells,
   (Langerhans cells here)        Langerhans cells)
  │ │ │ │ │ │ │ │ │ │ │ │ │ │  Stratum BASALE
  ─────────────────────────────  (Stem cells, mitosis,
   M = Melanocyte   K = Merkel    Melanocytes, Merkel)
  ═════════════════════════════  BASEMENT MEMBRANE
       │                         ─────────────────
  DERMIS (papillary)             Meissner's corpuscles
       │                         (light touch - rapid)
  ─────────────────────────────
  DERMIS (reticular)             Pacinian corpuscles
       │                         (vibration - rapid)
  ─────────────────────────────
  HYPODERMIS (subcutaneous fat)

  MNEMONIC (deep to surface): Come Let's Get Sun Burned
  = Basale, Spinosum, Granulosum, Lucidum, Corneum

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DIAGRAM 10.2 - Skin Cells Summary

  KERATINOCYTES (90%)     MELANOCYTES           LANGERHANS    MERKEL
  Main cell of skin       in Stratum BASALE      in Stratum    in Stratum
                                                 SPINOSUM      BASALE

  ┌────────────┐          ┌──────────────┐      ┌──────────┐  ┌───────┐
  │ produces   │          │ produces     │      │ Antigen  │  │Slow   │
  │ KERATIN    │          │ MELANIN      │      │presenting│  │adapt. │
  │ (protection│          │ ↓            │      │cell      │  │light  │
  │ barrier)   │          │ MELANOSOMES  │      │(like     │  │touch  │
  │            │          │ transferred  │      │ macro-   │  │sensor │
  │            │          │ to kertino-  │      │ phage)   │  │       │
  │            │          │ cytes        │      │          │  │       │
  └────────────┘          └──────────────┘      └──────────┘  └───────┘

  Skin color = amount of melanin (all races have same
               number of melanocytes, different activity)

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DIAGRAM 10.3 - Sensory Receptors Quick Map

  EPIDERMIS                    DERMIS (superficial)
  ─────────                    ────────────────────
  Free nerve endings            MEISSNER's corpuscles
  • Pain (sharp)                • Light touch
  • Temp (hot/cold)             • 2-point discrimination
  • Itch                        • RAPID adapting
  • ANY modality

  DERMIS (deep)                SUBCUTANEOUS
  ─────────────                ────────────────
  MERKEL's discs               PACINIAN corpuscles
  • Fine touch                 • Vibration
  • Texture/shape              • Deep pressure
  • SLOW adapting              • RAPID adapting

  JOINT CAPSULES / DEEP DERMIS
  ─────────────────────────────
  RUFFINI corpuscles
  • Skin stretch
  • Joint position (proprioception)
  • SLOW adapting

  ┌─────────────────────────────────────┐
  │  RAPID ADAPTING = Meissner, Pacinian│
  │  (respond to CHANGE in stimulus)   │
  │  SLOW ADAPTING = Merkel, Ruffini   │
  │  (respond to SUSTAINED stimulus)   │
  │  Mnemonic: "MP" = rapid, "MR" = slow│
  └─────────────────────────────────────┘

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MASTER SUMMARY DIAGRAM - All Topics at a Glance

╔══════════════════════════════════════════════════════════╗
║           GENERAL ANATOMY - NEET PG MASTER MAP          ║
╠══════════════════╦═══════════════════════════════════════╣
║  PLANES          ║  Sagittal(L/R), Coronal(F/B),         ║
║                  ║  Transverse(Up/Down)                  ║
╠══════════════════╬═══════════════════════════════════════╣
║  KEY LEVELS      ║  L1=Transpyloric, L4=Supracrestal(LP) ║
╠══════════════════╬═══════════════════════════════════════╣
║  BONE CELLS      ║  Progenitor→Blast(build)→cyte(maintain║
║                  ║  →clast(destroy, in Howship's lacuna) ║
╠══════════════════╬═══════════════════════════════════════╣
║  OSSIFICATION    ║  Intramembranous=skull,clavicle        ║
║                  ║  Endochondral=most bones               ║
╠══════════════════╬═══════════════════════════════════════╣
║  JOINTS          ║  Fibrous(immov), Cartilage(slight),   ║
║                  ║  Synovial(free) - 6 types              ║
╠══════════════════╬═══════════════════════════════════════╣
║  MUSCLE FIBERS   ║  Type I=slow/oxidative/red/endurance  ║
║                  ║  Type II=fast/glycolytic/white/power  ║
╠══════════════════╬═══════════════════════════════════════╣
║  VESSELS         ║  Elastic(windkessel)→Muscular→Arteriole║
║                  ║  (resistance)→Cap(exchange)→Vein(capacit)║
╠══════════════════╬═══════════════════════════════════════╣
║  LYMPH NODE      ║  Cortex=B cells, Paracortex=T+HEV,   ║
║                  ║  Many afferent IN, ONE efferent OUT   ║
╠══════════════════╬═══════════════════════════════════════╣
║  ANS             ║  Symp=TL(T1-L2), NorAdr, fight/flight ║
║                  ║  Para=CS(CN+S2-4), ACh, rest/digest   ║
║                  ║  EXCEPTION: Sweat glands=Symp+ACh!   ║
╠══════════════════╬═══════════════════════════════════════╣
║  GERM LAYERS     ║  Ecto=skin/CNS, Meso=muscle/bone,    ║
║                  ║  Endo=gut/resp, Neural crest=ganglia/ ║
║                  ║  adrenal medulla/melanocytes          ║
╠══════════════════╬═══════════════════════════════════════╣
║  AORTIC ARCHES   ║  3=carotid, 4L=aorta, 6L=ductus art. ║
╠══════════════════╬═══════════════════════════════════════╣
║  SKIN LAYERS     ║  CLGSB (deep to surface reversed)    ║
║  (deep→surface)  ║  Basale-Spinosum-Granulosum-Lucidum  ║
║                  ║  -Corneum                             ║
╚══════════════════╩═══════════════════════════════════════╝

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Study Tip: Print these diagram notes alongside the main notes. Cover the right column and test yourself. These visual layouts are specifically designed so that each diagram answers a likely NEET PG MCQ scenario.