The Probert Encyclopaedia of Medicine

SEMITENDINOSUS

The semitendinosus muscle originates from the ischium. Its long, narrow, fleshy belly ends two- thirds of the way down the thigh at its tendon, which inserts in the upper part of the tibia. It sits in the muscular groove formed in the semimembranosus muscle at the inner back of the thigh. The semitendinosus is innervated by the tibial nerve and supplied by the tibial artery. This muscle flexes the lower leg and extends the thigh at the hip joint. It is considered one of the hamstring muscles. Its tendon, along with the tendons of the semimembranosus and the gracilis muscles, forms the inner hamstring.
Research Semitendinosus