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: Rotation of the scapula, allowing the arm to be raised over 90 degrees. It also holds the scapula against the ribcage.
- Innervation: Long thoracic nerve.
- Blood supply: Thoracodorsal artery, superior thoracic artery, lateral thoracic artery.