MuscleThorax — lateral wall

Serratus anterior

Latin: M. serratus anterior

Location: Chest

View the serratus anterior in 3D

Origin

Outer surfaces of ribs 1–8/9 by fleshy digitations.

Insertion

Medial border of the scapula (anterior surface), from superior angle to inferior angle.

Action

Protracts the scapula (punching, pushing up) and upwardly rotates it with the trapezius for overhead abduction; holds the scapula against the rib cage.

Nerve supply

Long thoracic nerve (C5–C7).

Blood supply

Thoracodorsal and lateral thoracic arteries.

Clinical relevance

Long thoracic nerve injury (mastectomy, backpack straps) causes frank winged scapula — the serratus' digitations form the 'boxer's muscle'.

Educational anatomy reference, not medical advice. About this content.