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Semimembranosus

Other Terms: Musculus semimembranosus, Muscle semi-membraneux

Muscle parts

None

Latin name

Musculus semimembranosus

Latin muscle parts

None

Group

Thigh muscle – posterior compartment

Etymology

The English name for this muscle is the half skin muscle. The word semimembranosus comes from the combined Latin words semis meaning “half” and membrana meaning “skin.” This name describes the fact that about half of the muscle consists of a broad, membranous tendon.

Origin

Lateral aspect of the superior part of the ischial tuberosity

Insertion

Tubercle on the posterior surface of medial condyle of the tibia with slips to the medial and lateral borders of the medial condyle

Action

Extension of the hip; flexion of the knee; medial rotator of the semiflexed knee.

Nerve supply

Tibial nerve (L5, S1, and S2)

Blood supply

From proximal to distal, the muscle is supplied by the posterior branch of the obturator artery, the inferior gluteal artery, the perforating branches of the deep femoral artery, direct muscular branches from the popliteal artery, superior and inferior medial genicular branches of the popliteal artery, saphenous branch of the descending genicular artery from the femoral artery, and the anterior tibial recurrent artery.

Latin

Musculus semimembranosus

French

Muscle semi-membraneux

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