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.
Secondary Actions of the Sartorius Muscle
1. Assists with flexion of the thigh at the hip
- Psoas major
- Gluteus maximus
- Biceps femoris (long head)
- Adductor magnus (posterior part)
2. Assists with external rotation of the thigh at the hip
- Obturator internus
- Obturator externus
- Gemellus superior
- Gemellus inferior
- Quadratus femoris
- Tensor fascia latae
- Gluteus medius (anterior fibers)
- Gluteus minimus (anterior fibers)
3. Assists with abduction of the thigh at the hip
- Gluteus maximus (upper fibers)
- Gluteus medius
- Gluteus minimus
- 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
- Biceps femoris
- Semimembranosus (upper fibers)
- Vastus lateralis
- Vastus medialis
- Vastus intermedius
- Rectus femoris
5. Assists with internal rotation of the knee when the knee is flexed
- Biceps femoris
Gracilis also assists with internal rotation of the knee when the knee is flexed.
Muscle Pain Information: The sartorius muscle contributes to burning and stinging sensations in the front of the thigh going down into the inside of the knee.