Uncus
4774859
220747173
2008-06-21T11:21:05Z
Eubot
231599
Hatnote formatting, see [[User:Eubot/Hatnote formatting]]
{{for|the component of [[lepidoptera]]n [[genitalia]]|uncus (genitals)}}
{{Infobox Brain|
Name = {{PAGENAME}} |
Latin = |
GraySubject = 189 |
GrayPage = 826 |
Image = Gray732.png |
Caption = Scheme of [[rhinencephalon]]. (Uncus labeled at bottom right.) |
Image2 = Human brain inferior-medial view description 3.JPG |
Caption2 = Human brain inferior-medial view (Uncus is #5) |
IsPartOf = |
Components = |
Artery = |
Vein = |
Acronym = |
BrainInfoType = hier |
BrainInfoNumber = 21 |
MeshName = |
MeshNumber = |
DorlandsPre = u_02 |
DorlandsSuf = 12836346 |
}}
The anterior extremity of the [[hippocampal gyrus]] is recurved in the form of a hook, the '''uncus''', which is separated from the apex of the [[temporal lobe]] by a slight fissure, the [[incisura temporalis]].
Although superficially continuous with the hippocampal gyrus, the uncus forms [[morphology (biology)|morphologically]] a part of the [[rhinencephalon]].
The term uncus was coined by [[Félix Vicq-d'Azyr|Felix Vicq d’Azyr]] (1748–1794).<ref>
JC Tamraz, YG Comair. Atlas of Regional Anatomy of the Brain Using MRI (2006), p 8.</ref>
==Clinical significance==
The part of the [[olfactory cortex]] that is on the temporal lobe covers the area of the uncus, which leads into the two significant clinical aspects of the uncus: uncinate fits and uncal herniations.
* [[Seizures]], often preceded by hallucinations of disagreeable odors, often originate in the uncus.
* In situations of [[tumor]], [[hemorrhage]], or [[edema]], increased volume of the temporal lobe can push the uncus against the [[brainstem]] and its corresponding [[cranial nerves]]. If the uncus becomes herniated the structure lying just medial to it, cranial nerve III, can become compressed. This causes problems associated with a non-functional or problematic CNIII - pupil on ipsilateral side fails to constrict to light, etc. Brainstem damage is typically [[contralateral]] to the herniation.
==Additional images==
<gallery>
Image:Gray740.png|Inferior and posterior cornua, viewed from above.
Image:Gray747.png|Diagram of the fornix.
Image:Gehirn, basal - beschriftet lat.svg|Basal view of a human brain
</gallery>
==External links==
* {{WOROI|169}}
{{Gray's}}
{{neuroscience-stub}}
[[Category:Nervous system]]
==References==
<references/>
==External links==
* http://www.neuroanatomy.wisc.edu/coursebook/neuro3(2).pdf
{{Limbic system}}