World Library  
Flag as Inappropriate
Email this Article

Decussation of pyramids

Article Id: WHEBN0007112548
Reproduction Date:

Title: Decussation of pyramids  
Author: World Heritage Encyclopedia
Language: English
Subject: Projection fiber, Decussation
Collection:
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Decussation of pyramids

Brain: Decussation of pyramids
Deep dissection of brain-stem. Lateral view. ("pyramidal tract" visible in red, and "pyramidal decussation" labeled at lower right.)
Latin decussatio pyramidum
Gray's NeuroNames NeuroLex ID birnlex_1594

The two pyramids contain the motor fibers that pass from the brain to the medulla oblongata and medulla spinalis, corticobulbar and corticospinal fibers.

When these pyramidal fibers are traced downward, it is found that some three-fifths or more of them leave the pyramids in successive bundles, and decussate in the anterior median fissure of the medulla oblongata, forming what is termed the pyramidal decussation or motor decussation.

Having crossed the middle line, they pass down in the posterior part of the lateral funiculus as the lateral corticospinal tract.

Additional images

External links

  • Anatomy Atlases - Microscopic Anatomy, plate 17.326 - "Medula Oblongata"

This article incorporates text from a public domain edition of Gray's Anatomy.

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.