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Semimembranosus
The semimembranosus, so called from its membranous tendon of origin, is situated at the back and medial side of the thigh. It may be reduced or absent, or double, arising mainly from the sacrotuberous ligament and giving a slip to the femur.
Anatomy of the Semimembranosus Muscle
The Semimembranosus Muscle overlaps the upper part of the popliteal vessels.
It arises by a thick tendon from the upper and outer impression on the tuberosity of the ischium, above and lateral to the biceps femoris and semitendinosus.
The tendon of origin expands into an aponeurosis, which covers the upper part of the anterior surface of the muscle.
It is inserted mainly into the horizontal groove on the posterior medial aspect of the medial condyle of the tibia. The tendon of insertion gives off certain fibrous expansions.
Functions of the Semimembranosus Muscle
The Semimembranosus Muscle has two main functions:
- It helps to extend (straighten) the hip joint, and
- Flex the knee joint.
The Semimembranosus Muscle also helps to rotate the knee towards the center of the body.
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