Cranial structures refer to the bones and features that make up the skull, which protects the brain and supports the face. The human skull consists of 22 bones, including the frontal, parietal, temporal, and occipital bones. These bones are fused together, forming a rigid structure that encases the brain and provides attachment points for muscles. In addition to the bones, cranial structures include various openings and features, such as the foramina that allow nerves and blood vessels to pass through. The skull also contains the sutures, which are fibrous joints that connect the bones, allowing for slight movement during growth and development.