The semimembranosus extends the thigh at the hip and flexes the leg at the knee.
The semimembranosus is found at the posterior thigh and comprises of
muscles which run from the thighs to the knee. This muscle acts primarily on
the knee and hip joints.
It is used to extend the thigh at the hip region and also flexes and used to
perform internal rotation in the knee region in which both are found in the leg.
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