Semitendinosus: Origin, Insertion, Action & Nerve Supply


The semitendinosus is a largely tendinous muscle in the thigh. The semitendinosus muscle lies medially to the biceps femoris and covers the majority of the semimembranosus.

biceps femoris Origin-Insertion

Attachments of the Semitendinosus

Origin-It originates from the ischial tuberosity of the pelvis
Insertion-attaches to the medial surface of the tibia.

Function of the Semitendinosus

Flexion of the knee joint. Extension of the thigh at the hip joint. Medially rotates the thigh at hip joint, and the leg at the knee joint.

Nerve Supply of the Semitendinosus

Tibial part of the sciatic nerve.