Cranial joints, also known as sutures, are the fibrous joints that connect the bones of the skull. These joints allow for slight movement, which is essential during childbirth and for the growth of the skull in children. The main sutures include the coronal suture, sagittal suture, and lambdoid suture. As a person ages, cranial joints gradually fuse, leading to a more rigid skull structure. This fusion typically occurs in early adulthood and helps protect the brain. Understanding cranial joints is important in fields like anatomy and medicine, particularly in diagnosing and treating head injuries.