Semimembranosus - Muscle Physiology & Functional Anatomy


Semimembranosus Muscle




  • Upper outer quadrant of posterior surface of ischial tuberosity


  • Posterior aspect of the medial condyle of tibia below articular margin (fascia over popliteus & oblique popliteal ligament)

Major Arteries:

  • Profunda femoris

  • Gluteal artery


Neural Innervation:

  • Tibial portion of sciatic nerve (L5, S1-S2)



Trigger Points:

Hamstrings Trigger Points




Concentric Functions:

  • Knee flexion & internal rotation of the tibia

  • Hip extension


Eccentric Functions:

  • Decelerates knee extension, hip flexion & tibial external rotation

  • Assists to decelerate anterior pelvic rotation


Isometric Function:

  • Helps dynamically stabilize the lumbo-pelvic-hip complex during functional movement

Related Muscles





More Images of the Semimembranosus Muscle

Semimembranosus Heads


Cross Section of Semimembranosus


More Information about the Semimembranosus Muscle

The semimembranosus muscle is one of the three hamstrings along with the biceps femoris and semitendinosus.  The long head is biarticulate meaning it is involved in movement of 2 joints which in the case of the Semimembranosus are the hip & the knee joints.


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