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Serratus Anterior
Region: Chest Muscles · All chest muscles
Serratus Anterior at a glance
| Origin | Outer surfaces of the upper eight or nine ribs |
|---|---|
| Insertion | Front (costal) surface of the medial border of the scapula |
| Actions | Holds the shoulder blade flat against the chest wall; Pulls the scapula forward (protraction, as in punching); Rotates the scapula upward |
| Nerve supply | Long thoracic nerve (C5–C7) |
◆ Good to know
Injury to the long thoracic nerve (for example during axillary lymph node clearance) paralyses it and causes a winged scapula, most obvious when pushing against a wall.
More Chest Muscles
Please note: This page is an anatomy education summary for students and curious readers, not medical advice. Attachment points are given in their classic short form; individual anatomy varies, and detailed dissection-level descriptions belong in an anatomy atlas.