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4. Pectoralis Minor Muscle

The pectoralis minor is a triangular muscle that originates at the third to fifth ribs. It is connected to the coracoid process and helps with respiration. The pec minor is responsible for helping the scapula achieve a variety of motions, including downward rotation and abduction, due to its partnership with the serratus anterior. The muscle gets its blood supply from the thoracoacromial artery, which branches off into a larger artery in the upper chest.

Pectoralis-minor thoracoacromial decade3d / Getty Images

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