Serratus Anterior

• Click here for access to the full Anatomy Glossary.
• Right click on the image for a downloadable file of this muscle.
• Use of this artwork requires proper credit to be given (Permission: Dr. Joe Muscolino. www.learnmuscles.com – art work Giovanni Rimasti)

ATTACHMENTS:

• The serratus anterior attaches from the medial border of the scapula to ribs #1-9

ACTIONS:

• Protracts the shoulder girdle (scapula and clavicle) at the scapulocostal and sternoclavicular joints
• Upwardly rotates the shoulder girdle (scapula and clavicle) at the scapulocostal and sternoclavicular joints
• Elevates the shoulder girdle (scapula and clavicle) at the scapulocostal and sternoclavicular joints (upper fibers only)
• Depresses the shoulder girdle (scapula and clavicle) at the scapulocostal and sternoclavicular joints (lower fibers only)

NOTES:

• The serratus anterior looks like ribs in a well-developed individual.
• The serratus anterior also helps to hold the medial border of the scapula against the rib cage wall (i.e., prevents “winging of the scapula”).