The Pectoralis minor pulls down the coracoid process, which pulls the shoulder blade forward and down whenever you push, punch, or raise your arm out to the side (abduction) and return it to the starting position (adduction).

The muscle helps produce shoulder blade rotation against resistance. When the shoulder blade is fixed, the pectoralis minor becomes an accessory muscle when inhaling during deep upper chest breathing, often during respiratory distress.
This thin, flat muscle connects the ribs to the shoulder blade, and can be difficult to palpate, as it is under the pectoralis major.
Trigger points in the pectoralis minor have a distinct pattern
Tightness in this muscle causes problems when your arm is at shoulder level and you try to reach backward or forward, or forward and up.

Pain at the end of the ROM and restricted ROM are ways this muscle lets you know it’s in trouble. Compensations in this muscle are common causes of thoracic tunnel syndrome, CTS, and frozen shoulder. Blood vessel entrapment by TrPs in this muscle may contribute to some cases of Raynaud’s phenomenon.

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