Vastus Intermedius Muscle
Origin: Anterior and lateral aspects of the upper two-thirds of the femoral shaft
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 Vastus Intermedius
1. Extension of the leg at the knee
- Vastus Lateralis
- Vastus Medialis
- Rectus Femoris
- Biceps femoris
Tensor fasciae latae assists with extension of the knee through the iliotibial band.
Muscle Pain Information: The vastus intermedius muscle contributes to pain that centers in the front of the thigh.