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Anatomical Nomenclature Flowcharts
PDF Document · PDF
The PDF has 7 pages, each a colour-coded flowchart:
| Page | Content |
|---|---|
| 1 | Title page - overview of all topics |
| 2 | Anatomical Position - step-by-step flowchart of the 6 key features |
| 3 | Anatomical Planes - Coronal / Sagittal / Transverse with orientation & what each divides |
| 4 | Terms of Direction (pairs) - Anterior vs Posterior, Medial vs Lateral, Superior vs Inferior, Proximal vs Distal |
| 5 | Special Terms - Cranial / Caudal / Rostral + Superficial / Deep with examples |
| 6 | Inclusive Terminology - modern approach with the inclusive terms table |
| 7 | Summary chart - all 13 terms + all 3 planes at a glance |
Each box is colour-coded for quick visual identification, with clinical examples shown in italic text below the main boxes.
Define Bone and cartilage
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Excellent - I now have rich textbook content from Histology: A Text and Atlas to give a thorough, well-sourced answer. Here it is:
Bone and Cartilage
Both are specialized forms of connective tissue, derived from mesenchyme, and together make up the skeletal framework of the body.
BONE
Definition
Bone is a hard, mineralized connective tissue composed of cells embedded in a calcified extracellular matrix of type I collagen impregnated with hydroxyapatite [calcium phosphate crystals]. This combination gives bone both tensile strength (from collagen) and compressive rigidity (from mineral).
Functions
- Mechanical support and protection of organs
- Attachment for muscles (movement via lever system)
- Mineral reservoir (calcium and phosphate homeostasis)
- Houses bone marrow - site of hematopoiesis
- Endocrine function (FGF-23, osteocalcin signaling)
Classification
| Type | Structure | Location |
|---|---|---|
| Compact (cortical) bone | Dense, outer layer; organized into osteons (Haversian systems) | Shaft of long bones, beneath periosteum |
| Spongy (cancellous) bone | Sponge-like trabeculae; marrow fills spaces | Ends of long bones, vertebrae |
| Woven (immature) bone | Randomly arranged collagen; formed first during development | Embryonic; fracture repair (later replaced by lamellar bone) |
| Lamellar (mature) bone | Collagen arranged in concentric lamellae around Haversian canals | Most adult bone |
Cells of Bone
| Cell | Origin | Function |
|---|---|---|
| Osteoprogenitor cells | Mesenchymal stem cells (bone marrow) | Differentiate into osteoblasts under CBFA1/RUNX2 transcription factor |
| Osteoblasts | Osteoprogenitor cells | Secrete osteoid (unmineralized bone matrix); trigger mineralization via matrix vesicles; lifespan ~12 days |
| Osteocytes | Osteoblasts (once surrounded by matrix) | Mature bone cells residing in lacunae; connected via canaliculi; detect mechanical forces; regulate bone remodeling; make up ~95% of all bone cells; lifespan 10-20 years |
| Osteoclasts | Hematopoietic progenitor cells (GMP/CFU-GM) via RANK-RANKL signaling | Resorb bone matrix; essential for remodeling and repair |
Bone Matrix
- Organic component (35%): Type I collagen (main), plus osteocalcin, osteopontin, bone sialoprotein
- Inorganic component (65%): Hydroxyapatite crystals [Ca₁₀(PO₄)₆(OH)₂]
Bone Formation (Ossification)
- Intramembranous ossification - bone forms directly in mesenchyme (without a cartilage precursor). Produces flat bones: skull, mandible, clavicle.
- Endochondral ossification - a hyaline cartilage model is first formed, then progressively replaced by bone. Produces all other bones (long bones, vertebrae, etc.). The epiphyseal growth plate (with zones: reserve cartilage → proliferation → hypertrophy → calcified cartilage → resorption) drives bone lengthening in children.
Bone Remodeling
Bone is constantly remodeled throughout life by bone remodeling units (osteoclasts + osteoblasts acting together). This allows bone to adapt its shape to mechanical loads and repair micro-damage.
CARTILAGE
Definition
Cartilage is an avascular, aneural connective tissue composed of cells called chondrocytes embedded in an extensive extracellular matrix. More than 95% of cartilage volume is extracellular matrix. Because it lacks blood vessels, nutrients diffuse through the matrix from surrounding perichondrium.
"Cartilage is an avascular tissue that consists of chondrocytes and an extensive extracellular matrix... the large ratio of glycosaminoglycans (GAGs) to type II collagen fibers in the cartilage matrix permits diffusion of substances between blood vessels in the surrounding connective tissue and the chondrocytes."
- Histology: A Text and Atlas, Ch. 7
Functions
- Supports soft tissues (trachea, bronchi, nose, ear)
- Provides a smooth, low-friction articular surface at joints
- Acts as a shock absorber (bears compressive loads)
- Template for endochondral bone formation during development
- Enables bone growth via epiphyseal growth plates
Three Types of Cartilage
| Type | Matrix Components | Location | Key Feature |
|---|---|---|---|
| Hyaline cartilage | Type II collagen, GAGs, proteoglycans (aggrecan), multiadhesive glycoproteins | Articular surfaces, costal cartilages, trachea, bronchi, larynx, nose, fetal skeleton | Most common; glassy/translucent appearance; model for developing skeleton |
| Elastic cartilage | All of hyaline PLUS elastic fibers and elastic lamellae | Auricle (ear), epiglottis, eustachian tube | More flexible than hyaline; maintains shape after deformation |
| Fibrocartilage | All of hyaline PLUS abundant type I collagen fibers | Intervertebral discs, pubic symphysis, menisci of knee | Strongest/most rigid; resists both compression and tension |
Cartilage Matrix Composition (Hyaline)
- Collagen: Types II (bulk), IX, XI (regulate fibril size/interaction), X (hexagonal lattice), VI (pericellular attachment)
- Proteoglycans: Aggrecan is the main proteoglycan; binds hyaluronan, chondroitin sulfate, and keratan sulfate. Forms large aggregates that trap water (60-80% of cartilage wet weight is water)
- Multiadhesive glycoproteins (fibronectin, laminin, chondronectin)
Perichondrium
A dense irregular connective tissue sheath that surrounds most cartilage (except articular surfaces and fibrocartilage). It has:
- Outer fibrous layer - structural support
- Inner cellular layer - source of new chondrocytes (appositional growth)
Repair Limitation
Cartilage has very limited repair capacity due to its avascularity. Damage to hyaline cartilage (e.g. in osteoarthritis) is mostly repaired by dense fibrous connective tissue rather than true cartilage regeneration. In aging, hyaline cartilage is prone to calcification and can be replaced by bone.
Key Comparison: Bone vs. Cartilage
| Feature | Bone | Cartilage |
|---|---|---|
| Vascularity | Vascular (Haversian canals) | Avascular |
| Calcification | Fully mineralized | Only in calcified cartilage zone / aging |
| Main cell | Osteocyte | Chondrocyte |
| Main collagen | Type I | Type II (hyaline/elastic); Type I (fibro) |
| Repair capacity | High (periosteal cells activated) | Very limited |
| Rigidity | Very hard and rigid | Firm but resilient/pliable |
| Growth | Appositional + interstitial (epiphyseal plate) | Appositional + interstitial |
Sources: Histology: A Text and Atlas With Correlated Cell and Molecular Biology, Chapters 7 & 8
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