Semitendinosus
The
semitendinosus muscle is one of three muscles in the posterior compartment of the thigh. The other muscles are the
semimembranosus, and the
biceps femoris.
The muscles in the posterior compartment are often referred to as the “
hamstrings” muscles. Collectively, these muscles are responsible for extending the hip joint, and flexing the knee joint.
The biceps femoris lies laterally, and the semitendinosus and semimembranosus lie medially.
The semitendinosus gets its name from its structure which is comprised of a muscle belly which tapers into a long tendon that extends to insert onto the medial tibia. The semitendinosus sits on top of the semimembranosus. An easy way to remember this relationship is semitendinosus top.
You can learn more about the muscles of the posterior compartment in
this video.
Check out our
3D atlas where you can visualise and interact with these muscles for yourself.