The pectoralis major is a large, fan-shaped muscle and covers much of the front upper chest, starting at the breastbone (or sternum) including the second to the sixth ribs. This muscle moves the arm across the body.
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The pectoralis major is a large, fan-shaped muscle and covers much of the front upper chest, starting at the breastbone (or sternum) including the second to the sixth ribs. This muscle moves the arm across the body.
