The sciatic nerve divides into tibial and common peroneal components. At which level does this division typically occur?

• A At the ischial tuberosity
• B At the midpoint of the popliteal fossa
• C At the neck of the fibula
• D Apex of the popliteal fossa (or variably within the posterior thigh) ✓

Explanation

The sciatic nerve typically divides into the tibial nerve (medial) and common peroneal nerve (lateral) at the apex (superior angle) of the popliteal fossa, approximately at the level of the popliteal crease. However, the division can occur anywhere in the posterior thigh or even at the sciatic notch, as both components are actually separate from the beginning but enclosed in a common sheath. The common peroneal nerve winds around the neck of the fibula (not the division site) and is most vulnerable to injury there.

Reference: BD Chaurasia's Human Anatomy, 8th ed.

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Written and medically reviewed by the StethoPrep medical team.