Serratus Anterior Muscle: Actions, Origin, Insertion & Nerve Supply
Serratus Anterior Muscle Anatomy
- Action: Protracts and upwardly rotates the scapula; assists in deep inspiration.
- Origin: Outer surfaces of ribs 1–8 (costal surface).
- Insertion: Ventral (anterior) margin of the scapula (medial border).
- Nerve supply: Long thoracic nerve (C5, C6, C7).
This muscle is essential for scapular stability and overhead arm movement. Injury to the long thoracic nerve causes "winged scapula."
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