key facts

Origin

Rhomboid minor: Nuchal ligament, Spinous processes of vertebrae C7-T1

Rhomboid major: Spinous process of vertebrae T2-T5

Insertion

Rhomboid minor: Root (medial end) of spine of scapula

Rhomboid major: Medial border of scapula (from inferior angle to root of spine of scapula)

Action

Scapulothoracic joint: Draws scapula superomedially, Rotates glenoid cavity inferiorly; Supports position of scapula

Innervation

Dorsal scapular nerve (C4-C5)

Blood supply

Dorsal scapular artery, deep branch of transverse cervical artery, dorsal branch of upper five or six posterior intercostal arteries