Nerves (DPT) — Sciatic, Femoral & Obturator

DPT me lower limb nerves ko “roots → course → motor → sensory → clinical tests” ki line me yaad karna best hota hai. Is page me Sciatic nerve (VERY IMPORTANT), Femoral nerve, aur Obturator nerve ko complete long notes style me cover kiya gaya hai — with diagrams + MCQs.

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How to Study Nerves (DPT Method)

1) Roots first Har nerve ke spinal roots yaad karo. Exams me roots se question start hota hai.
2) Course = entrapment Where it passes (foramina, tunnels) → wahi par compression hoti hai.
3) Motor + sensory map Motor deficits (weakness) + sensory loss + reflex changes = diagnosis.
DPT Tip: Patient complaint ko “pain location + weakness pattern + reflex” se match karo. Example: posterior leg pain + foot drop → sciatic/peroneal pathway consider.

1) Sciatic Nerve (VERY IMPORTANT)

Sciatic nerve body ka largest nerve hai aur posterior thigh + most of leg/foot ko supply karti hai (via branches). DPT me sciatic nerve bohat high-yield hai because: sciatica, piriformis syndrome, disc herniation, aur foot drop patterns clinically common hain.

Feature High-yield info
Roots L4–S3
Exit from pelvis Greater sciatic foramen (usually below piriformis)
Terminal branches Tibial nerve + Common fibular (peroneal) nerve

1.1 Course (step-by-step)

  • Formed from sacral plexus on anterior surface of piriformis.
  • Exits greater sciatic foramen (usually below piriformis).
  • Runs in posterior thigh deep to hamstrings.
  • Divides near popliteal fossa into tibial + common fibular nerves.
Sciatic Nerve — Simplified Pathway (L4–S3) Sciatic nerve Common fibular Tibial High-yield: divides into tibial + common fibular near popliteal fossa.
Memory: sciatic = trunk nerve → popliteal region me split.
Sciatic nerve course (image placeholder)
Use your image: images/sciatic-nerve-course.jpg
Piriformis syndrome diagram (image placeholder)
Use your image: images/piriformis-syndrome.jpg

1.2 Clinical relevance (exam + PT)

Condition What happens Key DPT signs
Sciatica (radicular) Root irritation (often disc) Posterior leg pain + neuro tension
Piriformis syndrome Compression in gluteal region Buttock pain worse sitting
Common fibular injury Often near fibular head Foot drop, dorsum foot sensory loss
Very High Yield Test: Straight Leg Raise (SLR) — neural tension test for sciatic/roots (interpret clinically).
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2) Femoral Nerve

Femoral nerve anterior thigh ka main nerve hai. Signature: quadriceps (knee extension) + patellar reflex + medial leg sensation via saphenous nerve.

Feature High-yield info
Roots L2–L4
Course Under inguinal ligament → femoral triangle
Motor Quadriceps, sartorius, part of iliopsoas
Sensory Anterior thigh + medial leg/foot (saphenous)
Reflex Patellar (L3–L4)
Femoral Nerve (L2–L4) — Under Inguinal Ligament Inguinal ligament (concept) Saphenous (medial leg) Injury → weak knee extension + ↓ patellar reflex + anterior/medial sensory loss.
Femoral signature = quadriceps + patellar reflex + saphenous sensory.
Femoral nerve anatomy (image placeholder)
Use your image: images/femoral-nerve.jpg
Femoral triangle diagram (image placeholder)
Use your image: images/femoral-triangle.jpg

2.1 Clinical points

  • Femoral neuropathy: knee “giving way”, stairs difficulty.
  • Reduced patellar reflex suggests L3–L4/femoral pathway.
  • Differentiate from LFCN (meralgia paresthetica) — purely sensory lateral thigh.

3) Obturator Nerve

Obturator nerve medial thigh ka main nerve hai. Simple memory: Obturator = Adductors. It exits pelvis via obturator canal and supplies hip adductors + medial thigh skin (variable).

Feature High-yield info
Roots L2–L4
Exit Obturator canal
Motor Adductors + gracilis + obturator externus
Sensory Medial thigh (patchy)
Obturator Nerve (L2–L4) — Through Obturator Canal Obturator canal Medial thigh (adductors) Signature: adduction weakness + medial thigh sensory symptoms (variable).
Obturator canal = key anatomy point. Motor: adductors.
Obturator nerve anatomy (image placeholder)
Use your image: images/obturator-nerve.jpg
Medial thigh adductors (image placeholder)
Use your image: images/medial-thigh-adductors.jpg

4) Quick Comparison (Fast Revision)

Nerve Roots Main motor Main sensory Signature clinical
Sciatic L4–S3 Hamstrings + below knee via branches Most leg/foot via branches Sciatica; foot drop (fibular branch)
Femoral L2–L4 Quadriceps Ant thigh + medial leg (saphenous) ↓ patellar reflex; knee extension weakness
Obturator L2–L4 Adductors Medial thigh (variable) Adduction weakness; groin pain

5) MCQs (15 High Yield)

MCQ 1: Sciatic nerve roots?

A) L1–L3 B) L2–L4 C) L4–S3 D) S1–S4
Answer: C

MCQ 2: Sciatic nerve exits pelvis via:

A) Lesser sciatic foramen B) Greater sciatic foramen below piriformis C) Obturator canal D) Femoral canal
Answer: B

MCQ 3: Sciatic divides into:

A) Femoral+Obturator B) Tibial+Common fibular C) Saphenous+Sural D) Deep+Superficial fibular
Answer: B

MCQ 4: Foot drop most likely due to injury of:

A) Tibial B) Obturator C) Common fibular D) Femoral
Answer: C

MCQ 5: Femoral nerve roots?

A) L2–L4 B) L4–S3 C) T12–L2 D) S2–S4
Answer: A

MCQ 6: Femoral nerve main motor function:

A) Hip adduction B) Knee extension C) Plantarflexion D) Toe extension
Answer: B

MCQ 7: Patellar reflex is mainly:

A) L5–S1 B) L3–L4 C) S1–S2 D) L1–L2
Answer: B

MCQ 8: Femoral nerve passes:

A) Above inguinal ligament B) Under inguinal ligament C) Through obturator canal D) Through sciatic notch
Answer: B

MCQ 9: Femoral sensory to medial leg via:

A) Sural B) Saphenous C) LFCN D) Deep fibular
Answer: B

MCQ 10: Obturator nerve roots?

A) L2–L4 B) L4–S3 C) S1–S3 D) T12–L2
Answer: A

MCQ 11: Obturator nerve exits pelvis via:

A) Greater sciatic foramen B) Femoral canal C) Obturator canal D) Lesser sciatic foramen
Answer: C

MCQ 12: Obturator motor group:

A) Quadriceps B) Adductors C) Hamstrings D) Calf muscles
Answer: B

MCQ 13: Common neural tension test for sciatica:

A) Phalen B) SLR C) Tinel wrist D) Trendelenburg
Answer: B

MCQ 14: Femoral neuropathy sensory loss typically:

A) Lateral foot B) Anterior thigh + medial leg C) Posterior thigh only D) Sole of foot
Answer: B

MCQ 15: Obturator neuropathy causes weakness of:

A) Knee extension B) Hip abduction C) Hip adduction D) Plantarflexion
Answer: C

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