The Semispinalis Capitis is a muscle located in the back of the neck. It is part of the deeper layer of the neck muscles and plays a crucial role in supporting the head and neck. This muscle helps in extending and rotating the head, allowing for a range of movements. Originating from the upper thoracic and lower cervical vertebrae, the Semispinalis Capitis inserts into the occipital bone at the base of the skull. It is one of the components of the Semispinalis group, which also includes the Semispinalis Thoracis and Semispinalis Cervicis, contributing to the overall stability and mobility of the spine.