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Small pectoral muscle
Last reviewed: 07.07.2025
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The pectoralis minor muscle (m. pectoralis minor) is flat, triangular in shape, and is located directly behind the pectoralis major muscle. The muscle begins on the II-V ribs, near their anterior ends. Directed upward and laterally, it is attached by a short tendon to the coracoid process of the scapula.
Function: tilts the scapula forward. With a strengthened shoulder girdle, it lifts the ribs, helping to expand the chest.
Innervation: medial and lateral thoracic nerves (CVII-ThI).
Blood supply: thoracoacromial artery, anterior intercostal branches of the internal thoracic artery.
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