World Library  
Flag as Inappropriate
Email this Article

Posterior commissure

Article Id: WHEBN0004935266
Reproduction Date:

Title: Posterior commissure  
Author: World Heritage Encyclopedia
Language: English
Subject: Anterior commissure, Corpus callosotomy, Macaque brain development timeline, Talairach coordinates, List of Russian physicians and psychologists
Collection: Nervous System
Publisher: World Heritage Encyclopedia

Posterior commissure

Posterior commissure
Mesal aspect of a brain sectioned in the median sagittal plane. (Posterior commissure labeled at upper right.)
Median sagittal section of brain. The relations of the pia mater are indicated by the red color. (Label for posterior commissure is at center top.)
Latin commissura posterior
NeuroNames hier-475
NeuroLex ID Posterior commissure
Anatomical terms of neuroanatomy

The posterior commissure (also known as the epithalamic commissure) is a rounded band of white fibers crossing the middle line on the dorsal aspect of the upper end of the cerebral aqueduct. It is important in the bilateral pupillary light reflex.

Its fibers acquire their medullary sheaths early, but their connections have not been definitively determined. Most of them have their origin in a nucleus, the nucleus of the posterior commissure (nucleus of Darkschewitsch), which lies in the central gray substance of the upper end of the cerebral aqueduct, in front of the oculomotor nucleus.

Some are probably derived from the posterior part of the thalamus and from the superior colliculus, whereas others are believed to be continued downward into the medial longitudinal fasciculus.

The posterior commissure interconnects the pretectal nuclei, mediating the consensual pupillary light reflex.


  • Additional Images 1
  • See also 2
  • References 3
  • External links 4

Additional Images

See also


This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

External links

  • Overview at
  • Anatomy diagram: 13048.000-3 at Roche Lexicon - illustrated navigator, Elsevier

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, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for 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.