- Serratus Magnus
- Boxer's Muscle
- Inferior (Longer)
The serratus anterior holds scapula against thoracic wall.
scapula condition indicates weakness of serratus anterior.
They also help stabilize scapula during shoulder internal
and external rotation when shoulder is 90° abduction (Ekstom
RA, et al. 2003; Myers JB, et al. 2005)