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  • Diagram of the human Pectoralis major muscle
    Rights: National Aeronautics and Space Administration (NASA) Published 21 June 2007 Size: 19 KB Referencing Hub media

    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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