World Library  
Flag as Inappropriate
Email this Article

Unipolar neuron

Article Id: WHEBN0005022955
Reproduction Date:

Title: Unipolar neuron  
Author: World Heritage Encyclopedia
Language: English
Subject: Neuron, Anaxonic neuron, Bipolar neuron, Unipolar, Intrinsically photosensitive retinal ganglion cells
Collection: Neurons
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Unipolar neuron

Unipolar neuron
Example of several unipolar neurons from a nerve ganglion of a velvet worm (a primitive arthropod). The neurons were stained for serotonin immunoreactivity, and photographed using a confocal microscope, with multiple images overlaid and color-coded according to depth. Arrows mark the peripherally located cell bodies of several neurons, whose neurites extend into the centmral neuropil (np), where their complex ramifications are indiscernible. Scale bar: 50 micrometres.[1]
Details
Latin neuron unipolare
Identifiers
Code TH H2.00.06.1.00046
Anatomical terminology

A unipolar neuron is a type of neuron in which only one protoplasmic process (neurite) extends from the cell body. Most neurons are multipolar, generating several dendrites and an axon and there are also many bipolar neurons. Unipolar neurons that begin as bipolar neurons during development are known as pseudounipolar neurons.

Unipolar neurons are common in insects, where the cell body is often located at the periphery of the brain and is electrically inactive. These cell bodies often send a single neurite into the brain; however, this neurite may ramify into a large number of branches making a very complex set of connections with other neurites, in regions of neuropil.

Unipolar brush cells are neurons specific to the cerebellum and the granule region of the dorsal cochlear nucleus.

In all species, including vertebrates and invertebrates, many types of primary sensory neurons are pseudounipolar. Typically these have special structures for transducing some type of physical stimulus (light, sound, temperature, etc.) into electrical activity, no dendrites, and a single axon that conveys the resulting signals into the spinal cord or brain.

See also

References

  1. ^ Source: Mayer and Harzsch, BMC Evolutionary Biology 2007.
  • Martin, John Harry (2003). Neuroanatomy. McGraw-Hill Professional.  
  • Bullock, Theodore H.; G. Adrian Horridge (1965). Structure and Function in the Nervous Systems of Invertebrates: Volume II. W. H. Freeman. 
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.