Semitendinosus - Muscle Physiology & Functional Anatomy


Semitendinosus Muscle




  • Upper inner quadrant of posterior surface of ischial tuberosity & part of the sacrotuberous ligament


  • Proximal aspect of the medial tibial condyle (pes anserine)

Major Arteries:

  • Inferior gluteal artery

  • Perforating arteries


Neural Innervation:

  • Tibial portion of sciatic nerve (L5, S1)


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 movements


Related Muscles





More Images of the Semitendinosus Muscle

Semitendinosus Heads

Cross Section of Semitendinosus muscle



More Information about the Semitendinosus Muscle

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


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