vastus medialis (vastus internus)

Medial head of the quadriceps femoris. Origin: -> medial lip of the linea aspera (femur) Insertion: -> via common tendon of the quadriceps femoris to the patella & by the patellar ligament to the tibial tuberosity Action: 1) extends leg 2) probably most important muscle controlling movement of patella Innervation: femoral nerve

References

Stedman's Medical Dictionary 27th ed, Williams & Wilkins, Baltimore, 1999