RT Book, Section A1 Taheripour, Mohebat A2 Freeman, Brian S. A2 Berger, Jeffrey S. SR Print(0) ID 1102568992 T1 Anatomy of the Meninges T2 Anesthesiology Core Review: Part One Basic Exam YR 2014 FD 2014 PB McGraw-Hill Education PP New York, NY SN 9780071821377 LK accessanesthesiology.mhmedical.com/content.aspx?aid=1102568992 RD 2024/11/13 AB The brain, as well as the spinal cord, is surrounded by three layers of membranes: a tough outer layer (dura mater); a delicate, middle layer (arachnoid mater); and an inner layer, firmly attached to the surface of the brain (pia mater). Figure 133-1 illustrates these relationships. The cranial meninges are continuous with, and similar to, the spinal meninges through the foramen magnum. However, there is one important distinction: The cranial dura mater consists of two layers, and only one of these is continuous through the foramen magnum.