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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Cushioning and nourishing the brain and spinal cord and filling the ventricles of the brain is (are):

a. meninges.

b. myelin.

c. cerebrospinal fluid.

d. ganglia.

e. glucose.

Summary Introduction

Introduction:

The central organ of the nervous system is the brain. It consists of the cerebrum, brain stem, and cerebellum. The largest part of the brain is cerebrum. It is connected to the spinal cord by the brain stem. The long, thin tubular structure that starts from the brain stem (medulla oblongata) and ends at the lumbar region of the vertebral column is called the spinal cord. The spinal cord is composed of nervous tissue.

Explanation

Justification/explanation for the correct answer:

Option (c) is “CSF.” The clear colorless body fluid located in the spinal cord and brain is known as the cerebrospinal fluid. The ependymal cells of the choroid plexuses of the ventricles of the brain secrete the CSF. The main function of the CSF is to protect the brain and spinal cord from trauma. The CSF is also responsible for providing nutrients to the nervous system. Hence, option (c) is the correct answer.

Explanation for the incorrect answers:

Option (a) is “meninges.” Three layers of connective tissue surround the brain and the spinal cord. These layers of connective tissue (dura mater, arachnoid mater, and pia mater) are known as meninges. Meninges provide protection to the brain and the spinal cord...

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