Chapter 14, Problem 1CRQ

Summary Introduction

To label: The anatomical characteristics of ANS.

Introduction: The autonomic nervous system (ANS) is a functional division of the peripheral nervous system. It is structurally and functionally divided into two parts, namely the sympathetic nervous system (SNS) and the parasympathetic nervous system (PSNS).

Answer to Problem 1CRQ

Pictorial representation: Fig.1 represents the anatomical characteristics of ANS.

Fig.1: The anatomical characteristics of ANS

Explanation of Solution

The sympathetic nervous system consists of many nerve cells that are found in the peripheral nervous system and central nervous system. In this division, axons of the preganglionic neurons are shorter than the postganglionic fibers. Key neurotransmitters of sympathetic division are acetylcholine, norepinephrine, and epinephrine. In PSNS, the preganglionic fiber synapses over 6 to 8 ganglionic neurons. These neurons may be present in the intramural ganglia. An intramural ganglion refers to a group of neurons that are embedded in the wall of the tissue of target organ. The key neurotransmitter of parasympathetic division is acetylcholine.