|Derivation||Half- (semi) tendon.|
|Insertion||Medial condyle of tibia.|
|Action||Pulls the thigh backwards, rotates it inward, and bends the leg at the knee.|
Semitendinosus lies on the surface of the back of the thigh. Its belly runs from under gluteus maximus to about three-quarters of the length of the femur. Here it attaches to a slender tendon that runs under the medial condyle of the tibia, joining the neighboring tendons. This tendon is prominent on the back of the bent leg, forming the medial wall next to the hollow of the knee.