semimembranosus muscle

(redirected from musculus semimembranosus)

sem·i·mem·bra·no·sus mus·cle

(sem'ē-mem'bră-nō'sŭs mŭs'ĕl)
Origin, tuberosity of ischium; insertion, medial condyle of tibia and by membrane to tibial collateral ligament of knee joint, popliteal fascia, and via its reflected tendon of insertion (oblique popliteal ligament) lateral condyle of femur; action, flexes knee and rotates leg medially when knee is flexed, and contributes to the stability of extended knee by making capsule of knee joint tense; nerve supply, tibial.
Synonym(s): musculus semimembranosus [TA] .

semimembranosus muscle

Thigh muscle. Origin: ischial tuberosity. Insertion: medial condyle of tibia. Nerve: sciatic (L5-S2). Action: extends thigh, flexes and medially rotates leg.
See: leg for illus. (Muscles of the leg)
See also: muscle
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