ANATOMY

Detailed explanation-1: -The biceps femoris flexes the leg and, when the knee is flexed, rotates it laterally and aids in the extension of the thigh. The biceps femoris has a long and short head. The long head originates on the ischial tuberosity and inserts onto the head of the fibula.

Detailed explanation-2: -It runs straight down the leg (the Latin for straight is rectus), and attaches to the patella by the quadriceps femoris tendon. Actions: The only muscle of the quadriceps to cross both the hip and knee joints. It flexes the thigh at the hip joint, and extends at the knee joint.

Detailed explanation-3: -The biceps femoris muscle alongside the semitendinosus and semimembranosus form the hamstrings muscle. These muscles are responsible for thigh extension, knee flexion, and external rotation of both the hip and leg.

Detailed explanation-4: -Rectus femoris muscle. The rectus femoris muscle flexes the thigh at the hip joint and extends the leg at the knee joint.

Detailed explanation-5: -Interpretation: Biceps femoris long head has the potential to cause hip extension and adduction as well as knee flexion during the terminal swing phase of sprinting.