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Knee Extensors: The Quadriceps Muscles 
The quadriceps muscle is a group of four muscles located in the anterior thigh on both sides of the body.  Their names are: 1) Vastus Rectus (a.k.a. Rectus Femoris), 2) Vastus Medialis, 3) Vastus Lateralis, and 4) Vastus Intermedialis.  These muscles are shown in Figure 1 below:

Quadriceps Muscles

Figure 1.  The Quadriceps Muscles.


The nerve supply to the quadriceps muscles is supplied by the the femoral nerve .    See Figure 2:

Figure 2. LumboSacral Plexus showing the Femoral Nerve.

"LifeART (and/or) MediClip image copyright (2005) Lippincott Williams & Wilkins. All rights reserved."


The quadriceps main function is to extend the leg at the knee.  This occurs during activities such as running, jumping, kicking and walking.  This is illustrated in Figure 3 below:

Figure 3. Leg extended at the knee.
Muscles involved:  R-Vastus Rectus, R-Vastus Medialis,
 R-Vastus Lateralis, and R-Vastus Intermedialis


Always glad to help, and remember, at, “We’ll bring you up to speed!” ™
Dr. Larry Van Such

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