|Rhomboid- (diamond-) shaped. They are a grouping of rhomboid major and minor, so are referred to in the plural.
|Seventh cervical vertebra and thoracic vertebrae #1-5.
|Medial border of scapula.
|Draws the scapula toward the spine, and rotates its inferior angle medially.
Only a small portion of the rhomboids are directly visible under the skin; most of the muscle lies under trapiezius. When tensed, one can see it as a curve sweeping upward from the inferior angle of the scapula, crossing the line of trapezius at what could be thought of as a mirror-image of the angle.