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The Pectoralis
Major muscles (also known as the Pecs)
are located on the front of the rib cage.
The Pecs
attach to the humerus near the shoulder joint and
originate on the breastbone in the center of the
chest.
The fibers of the
Pectoralis muscles
run like a fan across the chest. The fan-like structure
of the Pecs
allows the humerus to move in a variety of planes
across the body.
The Pectoralis
Minor muscle (not shown in the diagram)
is located underneath the pectoralis major muscle,
attaching to the coracoid process of the scapula
and originating on the middle ribs.
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