DICS The physiological nature of the suture determines the type of motion in which it participates, and what it will allow. Understanding the nature of the suture allows us to not only understand its movement, but how we can optimize the performance of the sutural system. We know that the cranial bones have growth centers, some more than others. The sutural tissue is continuous with the periosteum of the skull and, eventually, the dural coverings of the brain and spinal cord.
Sutures have a synovial and a fibrous capsule.
They also have a vascular system and are innervated by neural tissue. There are variations of these types of sutures. There also are key pivot points in cranial sutures, allowing opposing motions, expansion and rotation to operate in an efficient and synchronized fashion. Sutures of one cranial bone may overlap another bone and partially through the suture change, and then bevel the other way. Interestingly, the coronal suture is also both a serrated and squamosal suture with rotational and expansive properties.