| Rhomboideus-occipitalis passes between trapezius and splenius to reach the occipital bone. |
| When this slip inserts onto the occipital bone or mastoid process it is named splenius capitis accessorius. |
| Attached to the mastoid process are the mm. sternocleidomastoideus, splenius capitis, and longissimus capitis. |
| When the splenius contracts it extends the head and neck, while inclining them to its own side. |
| The splenius represents a superficial prolongation of the lateral column of muscle to the head. |
| In another report, splenius colli accessorius or rhomboaxoides was found arising from the fascia of rhomboideus minor and serratus posterior inferior. |
