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Rhomboid Major and Minor Muscles – Functional Anatomy

Rhomboid Muscles

The anatomy of the rhomboid major and minor seem straightforward. These muscles attach the upper thoracic and lower cervical vertebrae to the scapula. Consequently, these muscles trap the ribs, sternum, and clavicle between their attachments.

The rhomboid major and minor are usually thought of as retracting the scapula. Surprisingly, they are very active in stabilizing the scapula during abduction and flexion of the humerus. These muscles also retract and stabilize the scapula in labored breathing. There are no statistically significant variations, other than occasionally being fused into one muscle.

Rhomboid Minor

The rhomboid major and minor are usually thought of as retracting the scapula. Surprisingly, they are very active in stabilizing the scapula during abduction and flexion of the humerus. These muscles also retract and stabilize the scapula in labored breathing. There are no statistically significant variations, other than occasionally being fused into one muscle.

Rhomboid Minor

Origin: the lower nuchal ligament, the supraspinous ligaments, and spinous processes along C7 and T1.

Insertion: the medial border of the scapula near the root of the spine of the scapula

Function: retraction of the scapula, assist in downward rotation of the scapula, stabilizes scapula during flexion and abduction

Rhomboid Major:

Origin: the supraspinous ligaments, and spinous processes along

Insertion: the medial border of the scapula near the root of the spine of the scapula

Function: retraction of the scapula, assist in downward rotation of the scapula, stabilizes scapula during flexion and abduction

Wikipedia entry for Rhomboid Minor. Wikipedia entry for Rhomboid Major.

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