Serratus Anterior

Written by Oliver Jones

Last updated January 18, 2024 • 6 Revisions •

The serratus anterior is a muscle of the anterior chest wall. It forms the medial border of the axilla region.

  • Attachments: The muscle consists of several strips, which originate from the lateral aspects of ribs 1-8. They attach to the costal (rib facing) surface of the medial border of the scapula.
  • Function: Rotates the scapula, allowing the arm to be raised over 90 degrees. It also protracts the scapula, holding it against the ribcage.
  • Innervation: Long thoracic nerve.
  • Blood supply: Thoracodorsal artery, superior thoracic artery, lateral thoracic artery.

Fig 1
The serratus anterior and pectoralis minor muscles.

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