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Semitendinosus Anatomy: Origin, Insertion, Action, Innervation

(Last Updated On: March 3, 2019)

Semitendinosus: Origin, Insertion, Action, Innervation

Origin: Upper, inner quadrant of the posterior surface of the ischial tuberosity, conjoined with the long head of biceps femoris
Insertion:Upper part of the medial surface of the tibia, behind the attachment of sartorius and distal and slightly anterior to the attachment of gracilis
Actions: Extension of the thigh at the hip, Flexion of the leg at the knee, Internal rotation of the leg at the knee
Innervation: Tibial portion of the sciatic nerve (L5, S1, S2)
Blood Supply:Branches from the internal iliac, popliteal, and profunda femoris arteries

Semit_muscle_md

Semitendinosus Actions With Agonists and Antagonists

Primary Actions of the Adductor Brevis

1. Extension of the thigh at the hip

  Agonists:

  • Gluteus maximus
  • Semimembranosus
  • Biceps femoris (long head)
  • Adductor magnus (posterior)

  Antagonists:

  • Psoas major
  • Iliacus

2. Flexion of the leg at the knee

  Agonists:

  • Biceps femoris
  • Semimembranosus

  Antagonists:

  • Vastus Lateralis
  • Vastus Medialis
  • Vastus Intermedius
  • Rectus Femoris

Gracilis, sartorius, popliteus, gastrocnemius, and plantaris assist with flexion of the knee

3. Internal rotation of the leg at the knee

  Agonists: 

  • Semimembranosus
  • Popliteus

  Antagonists:

  • Biceps femoris

Sartorius and gracilis assist with internal rotation of knee

For more information see: 

Semitendinosus Muscle Pain

 

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Recommended Anatomy Books:

Anatomy Coloring Book

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Basic Clinical Massage Therapy

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