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
Frequently asked questions
What does the rhomboid major do?
The rhomboid major retracts and rotates the scapula to depress the glenoid cavity; fixes scapula to thoracic wall.
What nerve innervates the rhomboid major?
The rhomboid major is innervated by the dorsal scapular nerve (C4, C5).
Where does the rhomboid major attach?
The rhomboid major originates from the spinous processes of T2-T5 and inserts on the medial border of the scapula, below the spine.
What is the blood supply of the rhomboid major?
The rhomboid major is supplied by the dorsal scapular artery.