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Lower Limb - High-Yield NEET PG Notes
(Gray's Anatomy for Students + Bradley & Daroff's Neurology)
1. REGIONS OF THE LOWER LIMB
| Region | Boundaries |
|---|---|
| Gluteal region | Iliac crest to gluteal fold (posterolateral) |
| Thigh | Inguinal ligament to knee joint (anterior); gluteal fold to knee (posterior) |
| Leg | Knee to ankle joint |
| Foot | Distal to ankle joint |
Key transition areas: Femoral triangle, popliteal fossa, tarsal tunnel (posteromedial ankle)
2. BONES - HIGH YIELD
Femur
- Largest bone in the body
- Head articulates with acetabulum; neck-shaft angle ~126° (coxa vara <120°, coxa valga >135°)
- Greater trochanter = attachment of gluteus medius & minimus
- Lesser trochanter = insertion of iliopsoas
- Linea aspera = posterior ridge, attachment for many muscles
Tibia & Fibula
- Tibia is weight-bearing; fibula is non-weight-bearing
- Tibial tuberosity = patellar tendon insertion
Foot Bones (7 tarsals)
- Proximal group: Talus + Calcaneus (largest tarsal)
- Intermediate: Navicular
- Distal group: 3 Cuneiforms + Cuboid
- 5 metatarsals + phalanges (great toe has 2; others have 3)
3. NERVES - THE MOST TESTED TOPIC
Lumbar Plexus (L1-L4) - anterior compartment
| Nerve | Roots | Key Muscles | Sensory |
|---|---|---|---|
| Femoral nerve | L2, L3, L4 | Quadriceps femoris (knee extension), iliopsoas, sartorius, pectineus | Anterior thigh + medial leg (via saphenous) |
| Obturator nerve | L2, L3, L4 | All medial compartment (adductors), except adductor magnus (ischial part) | Medial upper thigh |
| Lateral cutaneous nerve of thigh | L2, L3 | None (purely sensory) | Lateral thigh |
| Ilio-inguinal nerve | L1 | None | Medial upper thigh + perineum |
| Genitofemoral nerve | L1, L2 | Cremaster (genital branch) | Femoral branch = upper central anterior thigh |
Sacral Plexus (L4-S3) - posterior compartment
| Nerve | Roots | Key Muscles | Sensory |
|---|---|---|---|
| Sciatic nerve | L4-S3 | All posterior thigh + all leg & foot muscles | Lateral leg, lateral foot, sole |
| Superior gluteal nerve | L4-S1 | Gluteus medius, gluteus minimus, tensor fasciae latae | None |
| Inferior gluteal nerve | L5-S2 | Gluteus maximus | None |
| Posterior cutaneous nerve of thigh | S1-S3 | None | Posterior thigh |
| Pudendal nerve | S2-S4 | Perineal muscles | Perineum |
Sciatic Nerve Branches
The sciatic nerve (largest nerve in the body, L4-S3) divides in the upper popliteal fossa into:
Tibial nerve (L4-S3 - anterior divisions):
- All posterior compartment of thigh (except short head of biceps femoris)
- All posterior compartment of leg
- All intrinsic muscles of sole
- Skin: posterolateral lower leg + sole + lateral foot + little toe
Common fibular nerve (L4-S2 - posterior divisions):
- Short head of biceps femoris (posterior thigh)
- ALL anterior compartment of leg (tibialis anterior, extensor digitorum longus, extensor hallucis longus)
- ALL lateral compartment of leg (fibularis longus & brevis)
- Extensor digitorum brevis (dorsal foot)
- Skin: lateral leg, lateral ankle, dorsum of foot & toes
Memory trick: Tibial = Toe curlers (plantarflexion/inversion). Common Fibular = Foot dorsiflexion & eversion.
4. CLINICAL NERVE INJURIES - HIGHEST YIELD FOR NEET PG
Common Fibular (Peroneal) Nerve Injury ⭐⭐⭐
- Site: Neck of fibula (most vulnerable point - wraps around it superficially)
- Causes: Fibular neck fracture, tight cast/brace, prolonged bed rest with leg externally rotated, knee dislocation, arthroscopy
- Deformity: Foot drop (loss of dorsiflexion + eversion)
- Sensory loss: Lateral leg + dorsum of foot
- Gait: High-stepping (steppage) gait
- Also: Wasting of anterior tibial and fibular muscles
Sciatic Nerve Injury
- Sites: Misplaced IM injection in gluteal region (should be upper outer quadrant), hip fracture/dislocation, posterior approach hip replacement surgery
- Complete lesion: Weakness of all knee flexors + all muscles below knee + sensory loss of entire foot & leg (except medial leg supplied by saphenous nerve)
- Note: Fibular division is more commonly affected than tibial in proximal sciatic lesions (fibular fascicles fewer, less supported, taut at sciatic notch)
Piriformis Syndrome
- Sciatic nerve compressed by piriformis muscle
- Buttock pain on prolonged sitting, hip adduction/internal rotation
- AIF maneuver (Adduction, Internal rotation, Flexion) = diagnostic
- EDX usually normal
Superior Gluteal Nerve Injury ⭐⭐
- Denervation of gluteus medius + minimus + TFL
- Trendelenburg sign: Pelvis drops on contralateral side when standing on ipsilateral leg
- Trendelenburg gait (waddling gait)
- Common cause: Misplaced IM injection, hip surgery
Femoral Nerve Injury
- Loss of knee extension (quadriceps paralysis)
- Loss of knee jerk reflex
- Sensory loss: Anterior thigh + medial leg (saphenous nerve)
- Gait: Patient locks knee in hyperextension while walking
Obturator Nerve Injury
- Relatively protected; damaged during childbirth or pelvic surgery
- Loss of adduction + sensory deficit on medial thigh
Lateral Cutaneous Nerve of Thigh - Meralgia Paresthetica ⭐⭐
- L2, L3; purely sensory (no motor)
- Entrapment under inguinal ligament near ASIS
- Burning/tingling/numbness on lateral thigh
- Common in obesity, pregnancy, tight belts
- Treatment: Conservative (weight loss), steroid injection; rarely decompression
5. FEMORAL TRIANGLE ⭐⭐
Boundaries:
- Base (top): Inguinal ligament
- Medial border: Medial border of adductor longus
- Lateral border: Medial border of sartorius
- Floor: Iliopsoas (laterally) + pectineus + adductor longus (medially)
- Apex: Points inferiorly, continuous with adductor canal
Contents (lateral to medial) - "NAVY":
- Nerve (femoral) - lateral to sheath
- Artery (femoral)
- Vein (femoral)
- Y-lymphatics (in femoral canal = most medial compartment of femoral sheath)
Femoral hernia passes through the femoral canal (medial compartment of femoral sheath). More common in women. Inferior and lateral to pubic tubercle (unlike inguinal hernia which is superior and medial).
Femoral artery pulse: Palpable just inferior to inguinal ligament, midway between the ASIS and pubic symphysis (= mid-inguinal point).
6. ADDUCTOR CANAL (Hunter's Canal)
- Fascial tunnel on medial thigh, from apex of femoral triangle to adductor hiatus
- Contains: Femoral artery + vein, saphenous nerve (branch of femoral nerve)
- Femoral artery/vein pass through adductor hiatus (opening in adductor magnus) to become popliteal vessels
7. POPLITEAL FOSSA
Boundaries:
- Superior-medial: Semimembranosus + semitendinosus
- Superior-lateral: Biceps femoris
- Inferior-medial: Medial head of gastrocnemius
- Inferior-lateral: Lateral head of gastrocnemius
- Floor: Popliteal surface of femur + posterior knee capsule + popliteus
Contents:
- Popliteal artery (deepest - closest to bone)
- Popliteal vein
- Common fibular + tibial nerves (most superficial)
- Small saphenous vein (drains here)
- Popliteal lymph nodes
Order from bone outward: Art, Vein, Nerve (AVN)
8. MAJOR VESSELS
| Vessel | Origin | Key Points |
|---|---|---|
| Femoral artery | External iliac (below inguinal ligament) | Palpable at mid-inguinal point; becomes popliteal at adductor hiatus |
| Profunda femoris | Femoral artery (2-3 cm below inguinal lig.) | Main blood supply to thigh; gives medial & lateral circumflex femoral aa. |
| Medial circumflex femoral a. | Profunda femoris | Main supply to head of femur - at risk in femoral neck fractures |
| Popliteal artery | Continuation of femoral | Divides into anterior + posterior tibial aa. |
| Anterior tibial a. | Popliteal | Becomes dorsalis pedis at ankle |
| Posterior tibial a. | Popliteal | Palpable posterior to medial malleolus; gives fibular (peroneal) a. |
| Dorsalis pedis | Anterior tibial | Palpable on dorsum of foot |
Great saphenous vein:
- Longest vein in body
- Passes anterior to medial malleolus → medial leg → medial knee → drains into femoral vein at saphenous opening (fossa ovalis), 3-4 cm inferolateral to pubic tubercle
- Accompanied by saphenous nerve in leg
9. MUSCLE COMPARTMENTS OF THE LEG
| Compartment | Key Muscles | Nerve | Action |
|---|---|---|---|
| Anterior | Tibialis anterior, EHL, EDL, fibularis tertius | Deep fibular | Dorsiflexion, toe extension, inversion |
| Lateral | Fibularis longus, fibularis brevis | Superficial fibular | Eversion, weak plantarflexion |
| Posterior (superficial) | Gastrocnemius, soleus, plantaris | Tibial | Plantarflexion |
| Posterior (deep) | Tibialis posterior, FHL, FDL, popliteus | Tibial | Inversion, toe flexion |
Compartment syndrome most common in anterior compartment of leg after tibial fractures.
10. GLUTEAL REGION - KEY MUSCLES
| Muscle | Nerve | Action | Clinical |
|---|---|---|---|
| Gluteus maximus | Inferior gluteal (L5-S2) | Hip extension + lateral rotation | Weak going upstairs |
| Gluteus medius | Superior gluteal (L4-S1) | Hip abduction | Trendelenburg if paralyzed |
| Gluteus minimus | Superior gluteal (L4-S1) | Hip abduction | Same as medius |
| Piriformis | Nerve to piriformis (S1-S2) | Lateral rotation | Piriformis syndrome |
| Tensor fasciae latae | Superior gluteal (L4-S1) | Abduction + medial rotation | IT band syndrome |
Safe injection site in gluteal region: Upper outer quadrant (avoids sciatic nerve and superior gluteal vessels/nerves)
11. QUICK-FIRE HIGH-YIELD FACTS FOR NEET PG
| Fact | Answer |
|---|---|
| Largest nerve in the body | Sciatic nerve |
| Longest vein in the body | Great saphenous vein |
| Largest tarsal bone | Calcaneus |
| Foot drop cause | Common fibular nerve injury at fibular neck |
| Trendelenburg sign cause | Superior gluteal nerve palsy |
| Nerve for knee jerk | Femoral nerve (L3, L4) |
| Nerve for ankle jerk | Tibial nerve (S1, S2) |
| Femoral hernia (vs inguinal) | Inferior and lateral to pubic tubercle |
| Meralgia paresthetica nerve | Lateral cutaneous nerve of thigh (L2, L3) |
| Safe IM injection site | Upper outer quadrant of gluteal region |
| Profunda femoris origin | Femoral artery, 2-3 cm below inguinal ligament |
| Main blood supply to femoral head | Medial circumflex femoral artery |
| Muscle unlocking the knee | Popliteus (lateral rotation of femur on tibia) |
| Muscle attached to iliotibial band | Tensor fasciae latae + gluteus maximus |
| Nerve at risk in knee dislocation | Common fibular nerve |
| Sciatic nerve exit from pelvis | Greater sciatic foramen, below piriformis |
| Superior gluteal nerve exit | Greater sciatic foramen, above piriformis |
12. DERMATOMES - QUICK MAP
| Dermatome | Area |
|---|---|
| L1 | Inguinal region / groin |
| L2 | Anterior upper thigh |
| L3 | Anterior lower thigh / knee |
| L4 | Medial leg + medial dorsum of foot |
| L5 | Lateral leg + dorsum of foot + great toe |
| S1 | Sole + lateral foot + little toe |
| S2 | Posterior thigh |
| S3-S4 | Perineum |
13. REFLEXES
| Reflex | Root | Nerve |
|---|---|---|
| Knee jerk (patellar) | L3-L4 | Femoral |
| Ankle jerk (Achilles) | S1-S2 | Tibial |
| Plantar reflex (Babinski) | S1-S2 | Tibial |
Sources: Gray's Anatomy for Students (9780323934237); Bradley and Daroff's Neurology in Clinical Practice (9780323642613)
Study tip for NEET PG: Nerve injury questions are the most frequently tested. Memorize: foot drop = common fibular nerve at fibular neck; Trendelenburg = superior gluteal nerve; femoral hernia path via femoral canal (medial femoral sheath); and the NAVY mnemonic for the femoral triangle. The saphenous nerve is the only femoral nerve branch that goes below the knee - tested in questions about medial leg sensory loss after knee surgery.
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Lower Limb NEET PG
Presentation · PPTX
Here's what's inside the 26-slide deck (541 KB):
| # | Slide | Content |
|---|---|---|
| 1 | Title slide | Dark navy theme with topic badges |
| 2 | Table of Contents | 8 sections with card layout |
| 3-5 | Regions, Bones & Compartments | Femur key points, tarsal bones mnemonic, leg compartments table |
| 6-8 | Nerve Map | Lumbar plexus table, Sacral plexus table (color-coded) |
| 9-10 | Femoral Triangle & Adductor Canal | NAVY mnemonic visual, femoral hernia highlight |
| 11-12 | Vessels | Femoral → Popliteal → Tibial artery chain table |
| 13-15 | Clinical Nerve Injuries | Table + 4 clinical card panels (foot drop, Trendelenburg, meralgia, sciatic) |
| 16-17 | Dermatomes & Reflexes | 2-column layout L1-S4 map + reflex roots |
| 18-23 | 5 MCQs with Answers | NEET PG-pattern questions with green correct option + explanation boxes |
| 24-25 | Quick-Fire Facts | 14 high-yield Q&A cards |
| 26 | Final slide | Revision reminder badges |
Design: Navy/teal/gold palette with dark MCQ slides and light content slides for easy readability.
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