Serratus Anterior

Origin Superolateral surfaces of upper 8 or 9 ribs at the side of chest
Insertion Vertebral border of scapula
Action Draws scapula forward and upward; abducts scapula and rotates it; stabilizes vertebral border of scapula
Innervation Long thoracic nerve (C5, C6, C7) (C5, C6, C7)
Arterial Supply Circumflex scapular artery

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Muscle Atlas of the Extremities