Explanation The preganglionic neurons of the parasympathetic system originate from the S2, S3, and S4 sacral region of the spinal cord. Certain neurons also originate from the brain and innervate the neck, head, thorax, and the abdomen. The neurons from the sacral region innervate the pelvic organs like bladder, uterus, erectile tissue of external genitalia, and digestive organs. These organs are stimulated to perform functions such as defecation, erection, and urination by the parasympathetic outflow from the sacral region. The digestive tract is stimulated to perform peristalsis and the sphincters are relaxed to allow the movement of food particles. The digestive organs are stimulated to secrete enzymes for digestion...

8th Edition

ISBN: 9780134243818

Author: Elaine N. Marieb, Patricia Brady Wilhelm, Jon B. Mallatt

Publisher: PEARSON

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Question

Chapter 15, Problem 19RQ

Summary Introduction

To review:

The structure innervated by parasympathetic nerves originating from the sacral region of the parasympathetic division.

Introduction:

The parasympathetic division of autonomic nervous system is responsible for resting as well as digestion activities. It conserves body energy and stimulates housekeeping activities such as digestion, defecation, and urination among others. The neurons that perform parasympathetic functions originate from the brain and the sacral region of the spinal cord.

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Chapter 15, Problem 18RQ

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Chapter 15 Solutions

Human Anatomy (8th Edition)

Ch. 15 - Which fibers in the motor division of the PNS are...Ch. 15 - Prob. 2CYU Ch. 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. 6CYU Ch. 15 - Prob. 7CYU Ch. 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. 11CYU Ch. 15 - Prob. 12CYU Ch. 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 - Which of the following does not characterize the...Ch. 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. 6RQ Ch. 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. 17RQ Ch. 15 - Prob. 18RQ Ch. 15 - Prob. 19RQ Ch. 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. 2CRCAQ Ch. 15 - Prob. 3CRCAQ Ch. 15 - Prob. 4CRCAQ Ch. 15 - Prob. 5CRCAQ Ch. 15 - Prob. 6CRCAQ Ch. 15 - Prob. 7CRCAQ Ch. 15 - Prob. 8CRCAQ

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Solution Summary: The author explains that the parasympathetic division of autonomic nervous system is responsible for resting as well as digestion activities.

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