Anatomy & Physiology: The Unity of Form and Function, 7th Edition

Published by McGraw-Hill Education
ISBN 10: 0073403717
ISBN 13: 978-0-07340-371-7

Chapter 14 - Section 14.2 - Meninges, Ventricles, Cerebrospinal Fluid, and Blood Supply - Before You Go On - Page 517: 5

Answer

The three meninges, from superficial to deep, that surround the brain and spinal cord are: 1. **Dura Mater:** This is the outermost layer and is tough and fibrous. It serves to protect the brain and spinal cord. It consists of two layers, the periosteal layer (which is attached to the skull) and the meningeal layer (which is closer to the brain). The dura mater of the brain and spinal cord is similar in its structure, consisting of these two layers. 2. **Arachnoid Mater:** This is the middle layer and is named for its spider-web-like appearance. It contains cerebrospinal fluid (CSF) in the subarachnoid space, which cushions and protects the brain and spinal cord. 3. **Pia Mater:** This is the innermost layer and is in direct contact with the brain and spinal cord tissue. It is a delicate, thin membrane that follows the contours of the brain and spinal cord closely. The main difference between the dura mater of the brain and that of the spinal cord lies in their attachment and potential spaces: 1. **Attachment:** The dura mater of the brain is attached to the inner surface of the skull, whereas the dura mater of the spinal cord is attached to the vertebrae that make up the spinal column. This difference in attachment reflects the distinct anatomical locations and functions of the brain and spinal cord. 2. **Potential Spaces:** In the brain, there are potential spaces called "dural venous sinuses" located between the two layers of the dura mater. These sinuses serve important functions in draining blood and cerebrospinal fluid from the brain. In the spinal cord, there are no such dural venous sinuses. In summary, while the basic structure of the dura mater is similar in the brain and spinal cord, the attachment points and the presence of dural venous sinuses in the brain are the primary differences between the two.

Work Step by Step

The three meninges, from superficial to deep, that surround the brain and spinal cord are: 1. **Dura Mater:** This is the outermost layer and is tough and fibrous. It serves to protect the brain and spinal cord. It consists of two layers, the periosteal layer (which is attached to the skull) and the meningeal layer (which is closer to the brain). The dura mater of the brain and spinal cord is similar in its structure, consisting of these two layers. 2. **Arachnoid Mater:** This is the middle layer and is named for its spider-web-like appearance. It contains cerebrospinal fluid (CSF) in the subarachnoid space, which cushions and protects the brain and spinal cord. 3. **Pia Mater:** This is the innermost layer and is in direct contact with the brain and spinal cord tissue. It is a delicate, thin membrane that follows the contours of the brain and spinal cord closely. The main difference between the dura mater of the brain and that of the spinal cord lies in their attachment and potential spaces: 1. **Attachment:** The dura mater of the brain is attached to the inner surface of the skull, whereas the dura mater of the spinal cord is attached to the vertebrae that make up the spinal column. This difference in attachment reflects the distinct anatomical locations and functions of the brain and spinal cord. 2. **Potential Spaces:** In the brain, there are potential spaces called "dural venous sinuses" located between the two layers of the dura mater. These sinuses serve important functions in draining blood and cerebrospinal fluid from the brain. In the spinal cord, there are no such dural venous sinuses. In summary, while the basic structure of the dura mater is similar in the brain and spinal cord, the attachment points and the presence of dural venous sinuses in the brain are the primary differences between the two.
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