Semimembranosus - Muscle Physiology & Functional Anatomy

 

Semimembranosus Muscle

Anatomy

 

Origin:

  • Upper outer quadrant of posterior surface of ischial tuberosity

Insertion:

  • 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

 

Physiology

 

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


Antagonist:

Exercises:

 

 


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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