APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -The primary role of the biceps femoris muscle is knee flexion. Due to the long head of the muscle originating at the ischial tuberosity of the hip, it is also able to assist in hip extension.

Detailed explanation-2: -The long head of the biceps femoris muscle is innervated by the tibial portion (L5, S1, and S2) and the short head by the common fibular (peroneal) portion (L5, S1, S2) of the sciatic nerve. These muscles produce flexion at the knee and extension at the hip when they contract.