RT Book, Section A1 Ahern, Gerard A1 Brygel, Maurice SR Print(0) ID 1167657789 T1 Head and Neck T2 Exploring Essential Surgery YR 2014 FD 2014 PB McGraw-Hill Education PP New York, NY SN 9781264269587 LK accesssurgery.mhmedical.com/content.aspx?aid=1167657789 RD 2024/04/24 AB The skull is a closed cavity with numerous apertures for neurovascular transmission. Like the other body cavities, there is constant equalization of pressure between the CSF and venous systems via the arachnoid villi and the apertures. When this becomes lop-sided, it is the soft neural structures and their vascular supplies that are compromised.