Semitendinosus muscle

The semitendinosus muscle is a muscle of the inner thigh that connects the pelvis to the tibia. It acts to flex and Medial|medially rotate the knee and to extend the hip. It is one of the hamstrings.

Origin
The semitendinosus muscle originates from the pelvis, at the posterior surface of the ischial tuberosity on the ischium bone.

Insertion
The semitendinosus muscle inserts on the tibia, at the upper medial shaft, just below the gracilis.

Innervation
The semitendinosus muscle is innervated by the tibial nerve, a branch of the sciatic nerve.