Muscle Atlas

Pectoralis Minor

Origin: 3rd to 5th ribs near their costal cartilages
Insertion: Medial border and superior surface of coracoid process of scapula
Action: Stabilizes scapula by drawing it inferiorly and anteriorly against thoracic wall
Innervation: Medial pectoral nerves; clavicular head (C8 and T1)
Arterial Supply: Pectoral branch of the thoracoacromial trunk

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