Origin

Ischial tuberosity

Insertion

Medial surface of tibia

Action(s)

The semimembranosus helps to extend (straighten) the hip joint and flex (bend) the knee joint. It also helps medially rotate the knee.

Nerve Supply

The semimembranosus is innervated by the tibial part of the sciatic nerve.

Arterial Supply

Profunda femoris, gluteal artery

Physical Exam

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Clinical Importance

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Disease States

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Discussion

It may be reduced or absent, or double, arising mainly from the sacrotuberous ligament and giving a slip to the femur or adductor magnus.

Figures

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Credits:

From Wikipedia:
Semimembranosus

Attachments:


Semimembranosus.png (image/png)