Sartorius Anatomy

Sartorius Muscle

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

Primary Actions of the Sartorius Muscle

1. The sartorius assists other muscles in various movements. It does not have a primary action.

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Secondary Actions of the Sartorius Muscle

1. Assists with flexion of the thigh at the hip
Agonists:

  • Psoas major
  • Iliacus

Antagonists:

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

Pectineusrectus femoris, and psoas minor also assist with flexion of the thigh at the hip.

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

Agonists:

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

Antagonists:

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

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

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 part)

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 (upper fibers)

Antagonists:

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

Gracilispopliteus, 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.