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}}