semimembranosus

Origin

tuberosity of ischium

Insertion

• medial condyle of tibia & by membrane to tibial collateral ligament of knee, popliteal fossa, & via its reflected tendon of insertion (oblique popliteal ligament) lateral condyle of femur

Action

• flexes knee
• rotates leg medially when knee is flexed
• contributes to the stability of the extended knee by making the capsule of the knee joint tense

Innervation

tibial nerve

More general terms

• skeletal muscle (voluntary muscle)