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(Last Updated On: March 28, 2019)

Sartorius Muscle: Origin, Insertion, Action, Innervation

Origin: Inferior portion of the anterior superior iliac spine
Insertion: Upper medial surface of tibial shaft at the tibial flare, anterior to the attachment of gracilis
Actions: Assists with hip flexion, knee flexion, medial rotation of the knee, lateral rotation of the hip
Innervation: Anterior division of the femoral nerve (L3, L4)
Blood Supply: Branches from the femoral artery

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Sartorius Actions With Agonists and Antagonists

Primary Actions of the Sartorius

1. The Sartorius is not a prime mover and does not have a primary action

Secondary Actions of the Sartorius:

1. Assists with flexion of the thigh at the hip

  Agonists:

  • Psoas major
  • Illiacus

  Antagonists:

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

Pectineus, rectus femoris, and psoas minor also assist with flexion of the thigh at the hip. Additionally, adductor longus especially assists with the initial stages of flexion from full extension.

2. Assists with external rotation of the thigh at the hip

  Agonists:

  • Obturator internus
  • Obturator externus
  • Gemellus superior
  • Gemellus inferior
  • Quadratus femoris

  Antagonists:

  • Tensor fasciae latae
  • Gluteus minimus (anterior fibers)
  • Gluteus medius (anterior fibers)

Piriformis and gluteus maximus also assist with external rotation of the thigh at the hip when the hip is extended.

3. Assists with abduction of the thigh at the hip

  Agonists:

  • Gluteus maximus (upper fibers)
  • Gluteus medius
  • Gluteus minimus

  Antagonists:

  • Adductor longus
  • Adductor brevis
  • Adductor magnus (anterior)

Tensor fasciae latae also assists with abduction of the thigh at the hip.

4. Assists with flexion of the knee

  Agonists:

  • Biceps femoris
  • Semitendinosus
  • Semimembranosus

  Antagonists:

  • Vastus lateralis
  • Vastus medialis
  • Vastus intermedius
  • Rectus femoris

5. Assists with internal rotation of the knee when the knee is flexed

  Agonists:

  • Biceps femoris
  • Semitendinosus
  • Semimembranosus

  Antagonists:

  • Vastus lateralis
  • Vastus medialis
  • Vastus intermedius
  • Rectus femoris

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

5. Assists with internal rotation of the knee when the knee is flexed

  Agonists:

  • Popliteus
  • Semitendinosus
  • Semimembranosus

  Antagonists:

  • Biceps femoris

Gracilis also assists with internal rotation of the knee when the knee is flexed

For more information see:

 Sartorius Muscle: Hip, Upper Thigh and Knee Pain

 

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