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SPORTS ANATOMY LESSON #12
PRIMARY MOVERS OF THE ARMS
The primary movers of the arms are a group of four muscles locted on both sides of the body. Their names are: 1) pectoralis major , 2) posterior deltoid, 3) teres major and 4) latissimus dorsi. These muscles are shown in Figure 1 below:
Figure 1. The primary movers of the arms.
INNERVATION (NERVE SUPPLY)
The pectoralis major muscle is supplied by the anterior thoracic nerves. The posterior deltoid muscle is supplied by the circumflex nerve. The latissimus dorsi and teres major muscles are supplied by the subscapular nerve.
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Function
The primary movers of the arms have multiple functions. As a group, they are primarily responsible for performing athletic movements such as swinging a golf club, swinging a tennis racket or swinging a baseball bat. See Figure 2 below:
Figure 2. Swinging a baseball bat for a right hand player involves the pulling of
the arms forward from right to left.
Muscles involved: R-pectoralis major, L-posterior deltoid, L-teres major,
and L-latissimus dorsi.
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