Sciatic nerve terminal branches — FRCA Primary MCQ

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HardAnatomySciatic nerve terminal branchesFRCA Primary

After popliteal sciatic block for ankle surgery, plantar flexion and dorsiflexion are affected. Which two terminal nerves are blocked at this level?

Educational content. Not a substitute for clinical judgement or local policy.

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Correct answer: C — Tibial and common peroneal nerves

The sciatic nerve divides into tibial and common peroneal components, usually before or within the popliteal fossa. Femoral and obturator nerves arise from the lumbar plexus. The saphenous nerve is femoral in origin and is not covered by a sciatic block, which matters for medial ankle surgery. Block planning must match surgical territory.

Reference: RCoA Primary FRCA Syllabus; regional anaesthesia anatomy texts