Vastus Medialis Anatomy

Vastus Medialis Muscle

Origin: Lower part of the intertrochanteric line, along the spiral line to the medial lip of the linea aspera, the medial intermuscular septum and the aponeurosis of adductor magnus.
Insertion: Into the medial side of the quadriceps tendon, joining with rectus femoris and the other vasti muscles, enveloping the patella, then by the patellar ligament into the tibial tuberosity.
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 Vastus Medialis

1. Extension of the leg at the knee

Agonists:

  • Vastus Intermedius
  • Vastus Lateralis
  • Rectus Femoris

Antagonists:

  • Biceps Femoris
  • Semitendinosus
  • Semimembranosus

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

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