Name
Pronunciation
(rom-BOID)
Origin/Proximal Attachment
Spinous processes of T2-5, supraspinous ligament
Insertion/Distal Attachment
Medial border from scapular spine to inferior angle
Action/Relevance
Retracts & stabilizes the scapulaAssists to downwardly rotate the scapula
Innervation
Dorsal scapular nerve (C5)
Notes
The Rhomboideus major arises by tendinous fibers from the spinous processes of the second, third, fourth, and fifth thoracic vertebrę and the supraspinal ligament, and is inserted into a narrow tendinous arch, attached above to the lower part of the triangular surface at the root of the spine of the scapula; below to the inferior angle, the arch being connected to the vertebral border by a thin membrane. When the arch extends, as it occasionally does, only a short distance, the muscular fibers are inserted directly into the scapula.