Vastus intermedius

Definition

The vastus intermedius is one of the four muscles that comprise the quadriceps femoris group, located deep to the rectus femoris on the front of the thigh. It plays a crucial role in extending the knee joint.

Related terms

Quadriceps Femoris: A muscle group consisting of four muscles on the front of the thigh responsible for knee extension and hip flexion.

Rectus Femoris:

A muscle in the quadriceps femoris group that runs down the middle of the thigh, involved in knee extension and hip flexion.

Knee Joint:

A complex hinge joint between the thigh (femur) and lower leg (tibia and fibula) that allows for bending (flexion) and straightening (extension)