The rhomboid lies beneath the middle of the trapezius. It has 2 sections, the rhomboid major (lower) and the rhomboid minor (upper). It has two major actions: scapula adduction and downward rotation. The direction that the fibers run in the rhomboid makes the muscle ideally suited for downward rotation.
Origin
The rhomboid originates on the spinous processes of the upper thoracic vertebrae.
Insertion
It inserts on the medial border of the scapula.
Function
Scapula adduction and downward rotation.
