Name

# Pectoralis Minor

Pronunciation

(pek-to-RA-lis)

Origin/Proximal Attachment

Outer surface of ribs 2-5

Insertion/Distal Attachment

Medial aspect of coracoid process of the scapula

Action/Relevance

Depresses the scapula

Downwardly rotates the scapula

Assists to protract the scapula from a retracted position

Stabilizes the scapula

Innervation

Pectoral nerve – medial (C8-T1)

Notes

Pectoralis minor is a triangular-shaped muscle that lies deep to pectoralis major on each side of the thorax. It forms part of the anterior wall of the axilla. Anatomically, it provides a lanmark to deeper structures, notably the axillary artery and cords of the brachial plexus.