Expansion
Serratus anterior protracts the scapula and is supplied by the long thoracic nerve
Expansion
- Action - protracts the scapula (pulls it forward around the chest wall) and helps rotate it upward for overhead movement
- Nerve - long thoracic nerve (C5, C6, C7)
- Sign of injury - a winged scapula, most obvious when pushing against a wall
The upward rotation it provides is essential for abducting the arm above 90 degrees.