Anatomy Hip Joint Muscles

Explanation
The biceps femoris is a muscle located in the posterior compartment of the thigh. It is one of the hamstring muscles and is composed of two heads: the long head and the short head. The long head originates from the ischial tuberosity of the pelvis, while the short head originates from the posterior femur. Both heads of the biceps femoris converge and insert into the head of the fibula and the lateral condyle of the tibia. This muscle plays a key role in flexing the knee joint and in the extension of the hip joint. Additionally, it contributes to the external rotation of the leg when the knee is flexed.

Explanation
The tensor fasciae latae is a muscle located on the upper and outer thigh. It arises from the iliac crest of the pelvis and inserts into the iliotibial band (IT band), which runs down the lateral side of the thigh. The primary function of the tensor fasciae latae is to assist in stabilizing the pelvis and thigh during movement, particularly during activities such as walking, running, and climbing stairs. It also plays a role in abduction, or moving the thigh away from the midline of the body.