Page 372 - Atlas of Histology with Functional Correlations

E. motor.

5. The main function of Schwann cells and oligodendrocytes is to:

A. provide protection to the brain and spinal cord.

B. produce cerebrospinal fluid.

C. surround the axons with a myelin sheath.

D. surround capillaries and form a protective blood–brain barrier.

E. perform phagocytic functions around axons and nerves.

ANSWERS

1. Correct Answer: C. Subarachnoid space. From the ventricles in the brain,
CSF circulates around the brain and the spinal cord in the subarachnoid

space.

2. Correct Answer: B. Absorb cerebrospinal fluid (CSF). The arachnoid villi
penetrate the venous sinuses in the brain into which they deliver the
absorbed CSF.

3. Correct Answer: A. Spinal and cranial nerve ganglia. These neurons have a
single axon and are surrounded by capsule cells in the ganglia.

4. Correct Answer: E. Motor. Multipolar neurons in the spinal cord and brain
are considered motor neurons in that their action initiates responses in
muscles or glands.

5. Correct Answer: C. Surround the axons with myelin sheath. Schwann cells

surround single axons in the PNS, whereas oligodendrocytes surround
numerous axons in the CNS.

371