Definition: The term "occipitohyoid" refers to a specific structure in the human skull that is responsible for controlling the movement of the jaw. The occipitohyoid muscles are located on either side of the occipital bone, which is part of the brainstem and spinal cord. These muscles control the movement of the jaw and other facial muscles, including the smile and frown lines. Occipitohyoids have a unique structure that allows them to be activated by