BearCh07-ACRQedt - Chapter 07 The Structure of the Nervous...

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Chapter 07 – The Structure o f t he Nervous System Answers to Chapter Review Questions Page 1 of 3 Copyright © 2007. Lippincott Williams & Wilkins. Ancillary material to accompany Bear et al.: Neuroscience: Exploring the Brain, 3e Question 1: Are the dorsal root ganglia in the central or peripheral nervous system? Answer: The somatic sensory neurons collect information from the skin, muscles, and joints, and enter the spinal cord through the dorsal roots to synapse on dorsal root and ventral root neurons. The cell bodies of these neurons lie outside the spinal cord in clusters called dorsal root ganglia. The dorsal root ganglia are in the peripheral nervous system because they are situated outside the spinal cord. Furthermore, they are derived from the neural crest cells during embryologic development, as are all parts of the peripheral nervous system. Neurons of the central nervous system are derived from the neural tube. Question 2: Is the myelin sheath of optic nerve axons provided by Schwann cells or oligodendroglia? Why? Answer: The retina and optic nerve are part of the central nervous system, as they are derived from the neural tube. We know that oligodendroglia provide myelin for the central nervous
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This note was uploaded on 09/09/2009 for the course SPHSC 449 taught by Professor Peter during the Summer '09 term at University of Washington.

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BearCh07-ACRQedt - Chapter 07 The Structure of the Nervous...

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