Rectus FemorisThe structure indicated is the rectus femoris of the quadriceps group of thigh muscles. The rectus femoris is one of the muscles that makes up the quadriceps femoris, and is contained in the anterior compartment of the thigh. The muscles of the anterior compartment are all innervated by the femoral nerve and serve generally to extend the leg at the knee joint. The four muscles that make up the quadriceps femoris are the:
- Rectus femoris
- Vastus lateralis
- Vastus medialis
- Vastus intermedius
- Reflected head
- Straight head
Origin: Straight head – from anterior inferior iliac spine. Reflected head – groove just above acetabulum.
Insertion: Base of patella (then joins patella ligament to attach to tibial tuberosity)
Action: Flexion of the thigh at the hip joint. Extension of the leg at knee joint.
Innervation: Femoral nerveLearn more about the anatomy of the thigh muscles in this tutorial.