Plagiocephaly and the cranial dural system
The brain and spinal cord are protected by a 3-layered meningeal (dural) system. It adheres to the surface of the brain and spinal cord and attaches to the inside of the skull. The dura is also anchored at numerous points along the spinal column and finally at the base of the spine. This system contains the cerebrospinal fluid (CSF) that flows through, and around, our brain and spinal cord. CSF is made and re-absorbed at a rate of 20mL/hour and we have 80-150mL at any one time. It is the movement of our cranial bones during breathing, and our sacrum and spine when moving, that encourages the fluid to move within this system. Failure of our cranials and spine to move well may impede this flow.