Show Summary Details
Page of

Visceral Efferent Neurons: The Sympathetic and Parasympathetic Divisions 

Visceral Efferent Neurons: The Sympathetic and Parasympathetic Divisions
Visceral Efferent Neurons: The Sympathetic and Parasympathetic Divisions

Per Brodal

Page of

PRINTED FROM OXFORD MEDICINE ONLINE ( © Oxford University Press, 2021. All Rights Reserved. Under the terms of the licence agreement, an individual user may print out a PDF of a single chapter of a title in Oxford Medicine Online for personal use (for details see Privacy Policy and Legal Notice).

date: 07 March 2021

Chapter 28 deals with visceral efferent neurons that form the efferent part of the autonomic nervous system. The sympathetic system is of special importance in stressful situations, whereas the parasympathetic system contributes primarily to maintenance. Both systems consist of two consecutive neurons. Preganglionic neurons have their cell bodies in the cord or brain stem, and their axons terminate in ganglia. Postganglionic neurons send their axons to smooth muscles and glands. The preganglionic sympathetic neurons lie in the intermediolateral column of the cord. All preganglionic neurons use acetylcholine as transmitter in the ganglia. Most postganglionic sympathetic neurons use norepinephrine, while parasympathetic neurons use acetylcholine. The preganglionic sympathetic fibers enter ganglia in the sympathetic trunk. From there postganglionic fibers follow the spinal nerves to the extremities and trunk. Sympathetic fibers to the viscera follow splanchnic nerves. The enteric system consists of neurons in the wall of the gastrointestinal tract.

Access to the complete content on Oxford Medicine Online requires a subscription or purchase. Public users are able to search the site and view the abstracts for each book and chapter without a subscription.

Please subscribe or login to access full text content.

If you have purchased a print title that contains an access token, please see the token for information about how to register your code.

For questions on access or troubleshooting, please check our FAQs, and if you can't find the answer there, please contact us.