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. By TeachMeSeries Ltd (2025) Fig 1The serratus anterior and pectoralis minor muscles. Pro Feature - 3D Model You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Print Article Rate This Article