Delivery Info

HACKER SAFE certified sites prevent over 99.9% of hacker crime.
Run Faster Soccer Training Baseball Speed Jump Higher Golf Driving Tennis Isometrics & Bands More Info Order Here

Training Programs

Football Speed

Baseball Speed

Soccer Speed

Jump Higher

Track/Sprint Speed

Tennis Speed

Golf Swing Speed

Marital Arts Speed


The Knee Flexor (Hamstring) Muscles 

The knee flexor muscles are a group of three muscles located in the posterior thigh region on both sides of the body.  Their names are: 1) Semitendonosus, 2) Biceps Femoris and 3) Semimembranosus.  These muscles are also known as the hamstrings and are shown in Figure 1 below:

  Figure 1.  The Knee Flexors or Hamstring Muscles.


The nerve supply to the hamstring muscles is supplied by the great sciatic nerve.  It is the largest nerve cord in the body and is as thick around as your thumb.   It is formed by the fourth and fifth lumbar nerves and the first three sacral nerves.  See Figure 2 below. 


Figure 2.  The Great Sciatic Nerve.(Posterior View) 

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


The hamstrings function is to flex the leg behind the thigh.  This occurs during activities such as running and riding a bicycle.  This is illustrated in Figure 3 below.

Figure 3.  Flexion of the right leg behind the right thigh.

Muscles involved:  R-Semitendonosus, R-Biceps Femoris and R-Semimembranosus as shown.


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

Return to Main Sports Anatomy Page

Speed Training For All Sports
Speed Training Exercises For Faster Muscles

TSYS Merchant Solutions

Copyright 2012 - | Privacy Policy | Disclaimer | Terms of Use | Shipping Information | Affiliate | Contact
Protected by Copyscape DMCA Takedown Notice Search Tool