The semispinalis cervicis is a muscle located in the neck region, part of the deeper layer of the intrinsic back muscles. It originates from the upper thoracic vertebrae and inserts into the cervical vertebrae, specifically the spinous processes of the C2 to C5 vertebrae. This muscle plays a crucial role in extending and rotating the neck. Functionally, the semispinalis cervicis helps stabilize the cervical spine and contributes to maintaining proper posture. It works in conjunction with other muscles in the semispinalis group, which includes the semispinalis capitis and semispinalis thoracis, to facilitate complex movements of the head and neck.