Vastus intermedius

Origin: Anterior and lateral surfaces of shaft of femur

Insertion: Via common tendinous (quadriceps tendon) and independent attachments to base of patella; indirectly via patellar ligament to tibial tuberosity; medial and lateral vasti also attach to tibia and patella via aponeuroses (medial and lateral patellar retinacula)

Blood Supply:

Innervation: Femoral nerve (L₂, L₃, L₄)

Main Action: Extends leg at knee joint