In human anatomy, a hamstring is any one of the three posterior thigh muscles between the hip and the knee.
Tear of the hamstrings muscles at the ischial tuberosity seen on MRI (coronal STIR). The arrowheads indicate the tuber and the retracted tendon stump. Significant bleeding around and into the muscles.
The semimembranosus muscle is the most medial of the three hamstring muscles in the thigh. It is so named because it has a flat tendon of origin. It lies posteromedially in the thigh, deep to the semitendinosus muscle. It extends the hip joint and flexes the knee joint.
Semimembranosus muscle
Semimembranosus muscle
Muscles of thigh. Lateral view.
Muscles of thigh. Cross section.