What’s The PEC Muscle?
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PEC (or PECs) stands for Pectoralis major muscle.
The Pecs is a thick, fan-shaped muscle, situated at the upper front (anterior) of the chest wall.
It makes up the bulk of the chest muscles in the male and lies under the breast in the female.
The more frequent variations include greater or less extent of attachment to the ribs and sternum, varying size of the abdominal part or its absence, greater or less extent of separation of sternocostal and clavicular parts, fusion of clavicular part with deltoid, and decussation in front of the sternum.
The sternum (”chest” or breastbone) is a long flat bone located in the center of the thorax (chest).
It connects to the rib bones via cartilage, forming the rib cage with them, and thus helps to protect the lungs, heart and major blood vessels from physical trauma.
The sternum is sometimes cut open (a median sternotomy) to gain access to the thoracic contents when performing cardiothoracic surgery.
Deficiency or absence of the sternocostal part is not uncommon.
For more info visit:
http://en.wikipedia.org/wiki/Pec_(muscle)
http://en.wikipedia.org/wiki/Sternum
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