The muscle is often absent.

Proximal Attachment
Spinalis cervicis arises from the lower part of the ligamentum nuchae and the spinous processes of C7 (and occasionally T1 and T2).

Distal Attachment
It passes superiorly to insert onto the spinous processes of C2 (and sometimes C3 and C4).

Nerve Supply
Spinalis cervicis is supplied by the dorsal rami of C7 to C3.

Action
Spinalis cervicis works to bring about extension of the cervical spine.