This MedLibrary.org supplementary page on Calcarine fissure is provided directly from the open source Wikipedia as a service to our readers. Please see the note below on authorship of this content, as well as the Wikipedia usage guidelines. To search for other content from our encyclopedia supplement, please use the form below:
Related Sponsors
| Brain: Calcarine fissure | ||
|---|---|---|
 |
||
| Medial surface of left cerebral hemisphere. ("Calcarine fissure" visible at left.) | ||
 |
||
| Coronal section through posterior cornua of lateral ventricle. (Label for "Calcarine fissure" visible at bottom. | ||
| Latin | sulcus calcarinus, fissura calcarina | |
| Gray's | subject #189 820 | |
| Part of | Occipital lobe | |
| Artery | calcarine branch of medial occipital artery | |
| NeuroNames | hier-25 | |
The calcarine fissure (or calcarine sulcus) is an anatomical landmark located at the very caudal end of the medial surface of the brain.
Contents |
Anatomy
The calcarine sulcus begins near the occipital pole in two converging rami and runs forward to a point a little below the splenium of the corpus callosum, where it is joined at an acute angle by the medial part of the parietooccipital fissure. The anterior part of this fissure gives rise to the prominence of the calcar avis in the posterior cornu of the lateral ventricle.
Function
The calcarine sulcus is where the primary visual cortex is concentrated. The central visual field is located in posterior portion of the calcarine sulcus and the peripheral visual field in the anterior portion. It is interesting to note, though unsurprising, that the amount of cortex dedicated to each square millimeter of the visual field is highly non-proportional; significantly more cortex is dedicated to the processing of information originating from the fovea than other locations.[1] This is known as cortical magnification.
References
- ^ Wong A, Sharpe J (1999). "Representation of the visual field in the human occipital cortex: a magnetic resonance imaging and perimetric correlation". Arch. Ophthalmol. 117 (2): 208–17. PMID 10037566.
External links
- Roche Lexicon - illustrated navigator, at Elsevier 13048.000-3
- http://www2.umdnj.edu/~neuro/studyaid/Practical2000/Q31.htm
- Atlas of anatomy at UMich eye_38 - "The Visual Pathway from Below"
Wikipedia content modification information:
- This page was last modified on 2 October 2008, at 18:50.
Wikipedia Authorship and Review
Wikipedia content provided here is not reviewed directly by MedLibrary.org. Wikipedia content is authored by an open community of volunteers and is not produced by or in any way affiliated with MedLibrary.org.
Wikipedia Usage Guidelines
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article on "Calcarine fissure".
The URL for this specific entry is:
All Wikipedia text is available under the terms of the GNU Free Documentation License. (See Copyrights for details). Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc.