Extremities Exam 2026 - Muscles Practice Test 1 with Free Practice Questions and Study Guide

The biceps femoris short head is innervated by the common fibular (peroneal) division of the sciatic nerve. The sciatic nerve splits into tibial and common fibular components in the posterior thigh; the short head receives its motor supply from the common fibular branch as it courses around the fibular neck, while the long head is supplied by the tibial division. The tibial nerve handles the long head and other posterior thigh muscles, the obturator nerve covers thigh adductors, and the femoral nerve innervates the anterior thigh muscles.