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Serratus Anterior
Origin: Outer surface of upper 8 ribs (by finger-like slips)
Insertion: Vertebral border of scapula- anterior surface
Action: Protraction, upward rotation of scapula, stabilizes scapula against chest wall
Nerve: Long thoracic Nerve (Cervical 5, 6, 7)
Palpate: Lateral-anterior surface of ribs, below axilla during active scapular protraction
This muscle derives its name from the serrated origin. The lower fibers of the origin interdigitate with the external oblique. It is the strongest protractor of the scapula and holds the scapula against the chest wall to provide a fixed origin for muscles acting on the humerus. Weakness cause “winged scapula”.
