Shoulder Muscle - Serratus Anterior

Muscle Origin

Ribs 4–12

Muscle Insertion

Medial border of the scapula

Muscle Isolated Function

Concentric Action: Scapular protraction

Muscle Integrated Function

Eccentric Action: Scapular retraction Isometric Action: Stabilizes the scapula

Muscle Innervation

Long thoracic nerve (C5–C7)