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Pectoralis
major (chest, shoulder, arm pain)
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Pain Referral Zone
Pectoralis major originates on the ribs, the sternum and the clavicle and
inserts on the lateral aspect of the humerus near the head. Its principal
functions are medial rotation and adduction of the arm. Trigger points in
pectoralis major typically refer pain to the chest, shoulder and arm.
Translation: "Pectoralis major" means
"the larger muscle of the breast." It's that big muscle that covers
all of each side of your chest. It attaches to your ribs, your breastbone and
your collarbone, and goes up to attach to the side of the upper part of the bone
in your upper arm. Its main jobs are to pull your arm toward your body and to
rotate it inward. Trigger points in this muscle can cause pain in your chest,
your shoulder and your arm.
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