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Femoral nerve in fascia iliaca block — FRCA Primary MCQ

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ModerateAnatomyFemoral nerve in fascia iliaca blockFRCA Primary

A 68-year-old man requires a fascia iliaca block for fractured neck of femur analgesia. Local anaesthetic spreads beneath fascia iliaca lateral to the femoral artery. Which nerve is the main target for anterior thigh analgesia?

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Correct answer: D — Obturator nerve

The femoral nerve lies beneath fascia iliaca lateral to the femoral artery and supplies much of the anterior thigh and hip capsule. The obturator nerve may be variably affected but is not the main target for anterior thigh analgesia. The sciatic nerve is posterior and not reached by a fascia iliaca block. The key anatomical relationship is nerve, artery, vein from lateral to medial at the femoral triangle.

Reference: RCoA Primary FRCA Syllabus 2026; Anatomy for Anaesthetists