The rhomboid major is a skeletal muscle of the back that connects the scapula with the vertebrae of the spinal column.

[1] It originates from the spinous processes of the thoracic vertebrae T2–T5 and supraspinous ligament; it inserts onto the lower portion of the medial border of the scapula.

[citation needed] The rhomboid major arises from the spinous processes of the thoracic vertebrae T2–T5 as well as the supraspinous ligament.

Antagonists to this function (upward rotators of the scapulae) are the serratus anterior and lower fibers of the trapezius.

If the lower fibers are inactive, the serratus anterior and upper trapezius work in tandem with rhomboids and levators to elevate the entire scapula.

Functional demands have resulted in the evolution of individual muscles from the basal unit formed by the serratus anterior.