Muscle
Rhomboid major
Scapular retractor
High-yield
Retracts scapula; innervated by dorsal scapular nerve (C4–C5). Winging with weakness is subtle compared with serratus anterior.
Overview
A rhomboid-shaped muscle deep to trapezius that retracts and rotates the scapula, holding it to the thoracic wall.
Reference facts
- Origin
Spinous processes of T2–T5
- Insertion
Medial border of the scapula, below the spine
- Action
Retracts and rotates the scapula to depress the glenoid cavity; fixes scapula to thoracic wall
- Innervation
Dorsal scapular nerve (C4, C5)
- Blood supply
Dorsal scapular artery