Human Anatomy
9th Edition
ISBN: 9780135168059
Author: Marieb, Elaine Nicpon, Brady, Patricia, Mallatt, Jon
Publisher: Pearson Education, Inc.,
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Textbook Question
Chapter 15, Problem 1CYU
Which fibers in the motor division of the PNS are not myelinated?
Expert Solution & Answer
Summary Introduction
To review:
The non-myelinated fibers in the motor division of the PNS.
Introduction:
Brain is the main organ of the body that controls and coordinates all the processes and the system is known as the nervous system. This system is comprised of the brain, the spinal cord, and the nerves originated from them or supplied throughout the body. The nerves or neurons are the structural unit of the nervous system that transmit information from the brain to various body parts, and from different body parts to the brain.
Explanation of Solution
The nervous system is divided into two categories, including the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS involves the brain and the spinal cord, whereas the PNS is represented by the cranial nerves arising from the brain and the spinal nerves originating from the spinal cord.
The PNS is further classified into: sensory (afferent) division and motor (efferent) division. The sensory division transmits impulses from the body parts to the CNS, whereas the motor division transmits impulses from the CNS to peripheral organs for the production of a response against the generated.
The motor division is classified into: the somatic nervous system (SNS) and the autonomic nervous system (ANS). The motor units in the autonomic nervous system include the transmission of impulse through the two-neuron pathway; the preganglionic and postganglionic axon.
The preganglionic axon cell body lies in the CNS and they form a synapse with the second that is the postganglionic axon. The postganglionic axon receives neurotransmitters from the synapse and enter into the visceral organs or the target sites. They are unmyelinated and thinner in nature.
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Chapter 15 Solutions
Human Anatomy
Ch. 15 - Which fibers in the motor division of the PNS are...Ch. 15 - Prob. 2CYUCh. 15 - Where are the sympathetic ganglia located? Where...Ch. 15 - Are visceral sensory fibers considered part of the...Ch. 15 - Which spinal nerves carry parasympathetic...Ch. 15 - Prob. 6CYUCh. 15 - Prob. 7CYUCh. 15 - Why are white rami communicantes located only on...Ch. 15 - What is the general effect of sympathetic...Ch. 15 - Which types of autonomic fibers (preganglionic,...
Ch. 15 - Prob. 11CYUCh. 15 - Prob. 12CYUCh. 15 - Which region of the CNS is the main control center...Ch. 15 - Which embryonic tissue forms the postganglionic...Ch. 15 - Which division of the ANS is deficient in...Ch. 15 - Prob. 1RQCh. 15 - For each of the following terms or phrases, write...Ch. 15 - The thoracic splanchnic nerves contain which kind...Ch. 15 - The collateral ganglia contain which kind of cell...Ch. 15 - Preganglionic sympathetic neurons develop from (a)...Ch. 15 - Prob. 6RQCh. 15 - The white rami communicantes contain what kind of...Ch. 15 - Collateral sympathetic ganglia are involved. with...Ch. 15 - Is the visceral sensory nervous system part of the...Ch. 15 - (a) Describe the anatomical relationship of the...Ch. 15 - What effect does sympathetic activation have on...Ch. 15 - Which of the effects listed in question 11 would...Ch. 15 - A friend asks you how the parasympathetic...Ch. 15 - What manifestations of decreased ANS efficiency...Ch. 15 - The students in anatomy class were having...Ch. 15 - Describe the sympathetic pathways to the (a)...Ch. 15 - Prob. 17RQCh. 15 - Prob. 18RQCh. 15 - Prob. 19RQCh. 15 - How do the somatic motor and visceral motor (ANS)...Ch. 15 - A 1-year-old infant has a swollen abdomen and is...Ch. 15 - Prob. 2CRCAQCh. 15 - Prob. 3CRCAQCh. 15 - Prob. 4CRCAQCh. 15 - Prob. 5CRCAQCh. 15 - Prob. 6CRCAQCh. 15 - Prob. 7CRCAQCh. 15 - Prob. 8CRCAQ
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