SPORTS ANATOMY LESSON #8
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:
Figure 1. The extensors of the forearms.
INNERVATION (NERVE SUPPLY)
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:
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.
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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:
L/R triceps brachii and L/R anconeus.
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