The spinalis capitis is a muscle located in the back of the neck, part of the larger group known as the erector spinae. It plays a role in extending and rotating the head. This muscle is situated near the upper part of the spine and connects the cervical vertebrae to the skull. Functionally, the spinalis capitis helps maintain posture and supports movements of the head and neck. It works in conjunction with other muscles, such as the longissimus capitis and semispinalis capitis, to facilitate coordinated motion and stability in the cervical region.