Rhomboideus Major Muscle

Description

Rhomboideus major spans from the spinous processes of T2 to T5 medially to the medial border of the scapula laterally, forming a broad diamond-shaped sheet deep to trapezius and inferior to rhomboideus minor. Its fibers run inferolaterally as they approach the scapula, blending with fascia along the vertebral border near the level of the scapular spine down toward the inferior angle. Levator scapulae lies superior to the rhomboids, and serratus anterior occupies the costal surface of the scapula anteriorly, providing a useful contrast in layer relationships. Clear margins. Clinically, rhomboideus major is a frequent pain generator in interscapular myofascial pain, and its trigger points can refer aching along the medial scapular border that patients often describe as a deep knot beneath the shoulder blade. Understanding its orientation matters in scapular dyskinesis, where weakness or inhibition of the scapular retractors can contribute to excessive protraction and altered scapulothoracic rhythm during overhead activity. The muscle also frames the safe dissection plane when reflecting trapezius in posterior scapular approaches, and it helps you localize the dorsal scapular nerve, which typically courses on its deep surface after piercing the middle scalene. Use this artwork for teaching posterior thoracic wall layers in gross anatomy, kinesiology modules on scapular retraction and downward rotation, or clinical resources on interscapular pain patterns and dorsal scapular neuropathy. It also suits surgical atlases describing trapezius elevation and exposure of the medial scapular border. Anatomical accuracy verified by SciePro's Medical Advisory Board.