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Rectus Femoris: Origin, Insertion, Action, Innervation

Rectus Femoris Anatomy

Rectus Femoris Muscle

Origin: Anterior inferior iliac spine, supraacetabular groove
Insertion: Tibial tuberosity (via patellar ligament), patella
Actions: Extension of the leg at the knee
Innervation: Posterior division of the femoral nerve (L3, L4)
Blood Supply: Femoral artery and branches from the profunda femoris artery

Primary Actions of the Rectus Femoris

1. Extension of the leg at the knee

Agonists:

  • Vastus intermedius
  • Vastus lateralis
  • Vastus medialis

Antagonists:

  • Biceps femoris
  • Semitendinosus
  • Semimembranosus

Tensor fasciae latae assists with extension of the knee through the iliotibial band.

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Secondary Actions of the Rectus Femoris:

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

  • Psoas Major
  • Ilicus

Antagonists:

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

Pectineus, sartorius, and psoas minor also assist with flexion of the thigh at the hip.

Muscle Pain Information: The rectus femoris muscle contributes to weak, stiff, painful knees.

Recommended Muscle Anatomy Books

An excellent book for those beginning the study of anatomy. Coloring helps memory retention.

For intermediary anatomy students learning skeletal and muscle structure.

For beginning and intermediary anatomy . Muscle overlays on the human body. Excellent visuals!