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Forearm Extensors
The extensors of the forearms are a group of two muscles located in the posterior arm region on both sides of the body.  Their names are: 1) Triceps Brachii and 2) Anconeus.  These muscles are shown in Figure 1 below:

Extensors of the forearms muscles

Figure 1. The extensors of the forearms.



The triceps muscle is suppled by the radial nerve (C6, C7 and C8) which is a branch from the musculo-spiral nerve and the anconeus muscle is also supplied by the radial nerve (C7, C8 and T1) which too is a branch from the musculo-spiral nerve. See Figure 2 below:

Forearms Nerves

Figure 2.  The brachial plexus.
Musculo-spiral nerve:  Branches C6, C7 and C8 supply the triceps brachii muscle.
Branches C7, C8 and T1 supply the anconeus muscle.

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


The triceps and anconues muscles main function is to extend the forearm.  This occurs during athletic movements such as swinging a golf club, shooting a basketball, throwing a baseball or football and boxing.  See Figure 3 below:

Starting Postion

Ending Position

Forearm extension.
L/R triceps brachii and L/R anconeus.


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Dr. Larry Van Such

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