Pectoralis Minor

Written by Oliver Jones

Last updated October 7, 2022 • 4 Revisions •

The pectoralis minor is a muscle of the anterior chest wall. It lies underneath the larger pectoralis major and contributes to the anterior wall of the axilla.

  • Attachments: Originates from the 3rd-5th ribs and inserts into the coracoid process of the scapula.
  • Function: Stabilises the scapula by drawing it anteroinferiorly against the thoracic wall.
  • Innervation: Medial pectoral nerve.
  • Blood supply: Pectoral branch of thoracoacromial artery.

Fig 1
The serratus anterior and pectoralis minor muscles.

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