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 semi
Semimembranosus muscle
Muscles of thigh. Lateral view.
Muscles of thigh. Cross section.
A hamstring is any one of the three posterior thigh muscles in human anatomy between the hip and the knee: from medial to lateral, the semimembranosus, semitendinosus and biceps femoris.
Photo depicting a torn hamstring in the right thigh
Tear of the hamstrings muscles at the ischial tuberosity seen on MRI (visible on a coronal STIR MRI sequence). The arrowheads indicate the tuber[which?] and the retracted tendon stump.[which?] Significant bleeding around and into the muscles.