Serratus Anterior

Joe Muscolino

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Serratus-Anterior_HR

Right lateral view of the right serratus anterior. The arm and scapula are ghosted in. Permission Joseph E. Muscolino.

ATTACHMENTS:

 

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)

 

TRIVIA NOTE:

  • 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”).