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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Muscle Pain Information: The vastus medialis muscle contributes to pain in the inside of the lower thigh and knee.
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For intermediary anatomy students learning skeletal and muscle structure.
For beginning and intermediary anatomy . Muscle overlays on the human body. Excellent visuals!