Infobox Brain
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GraySubject = 189
GrayPage = 826

Caption = Scheme of rhinencephalon. (Uncus labeled at bottom right.)

Caption2 = Human brain inferior-medial view (Uncus is #5)
IsPartOf =
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Artery =
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Acronym =
BrainInfoType = hier
BrainInfoNumber = 21
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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 morphologically a part of the rhinencephalon.

The term uncus was coined by Felix Vicq d’Azyr (1748–1794). [

JC Tamraz, YG Comair. Atlas of Regional Anatomy of the Brain Using MRI (2006), p 8.]

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.


External links



External links

* http://www.neuroanatomy.wisc.edu/coursebook/neuro3(2).pdf

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Look at other dictionaries:

  • uncus — ● uncus nom masculin (latin uncus, crochet) Apophyse du corps des vertèbres cervicales. uncus [ɔ̃kys; œ̃kys] n. m. ÉTYM. XXe; mot lat., « crochet ». ❖ ♦ Anat. || Uncus de l hippocampe : « segment réfléchi de l extrémité antérieure de la cinquième …   Encyclopédie Universelle

  • Uncus — (lat. Haken) heißt das an der Oberfläche des Temporallappens sichtbare hakenförmig nach hinten umgebogene Vorderende des Gyrus parahippocampalis bzw. dessen Fortsetzung. Der Spalt zwischen dem Hinterende des Uncus und dem darunterliegenden Gyrus… …   Deutsch Wikipedia

  • uncus — extremo anterior, en forma de gancho, de la circunvolución del hipocampo [A14.1.09.235] imagen anatómica [véase http://www.iqb.es/diccio/u/u.htm#uncus] Diccionario ilustrado de Términos Médicos.. Alvaro Galiano. 2010 …   Diccionario médico

  • Uncus — Un cus, n.; pl. {Unci}. [L.] (Zo[ o]l.) A hook or claw. [1913 Webster] …   The Collaborative International Dictionary of English

  • Uncus — (lat.), Haken …   Pierer's Universal-Lexikon

  • uncus — [uŋ′kəs] n. pl. unci [un′sī] [ModL < L, a hook < IE base * ank > ANGLE1] Anat. a hooked process …   English World dictionary

  • uncus — n.; pl. unci [L. uncus hook] 1. (ARTHROPODA: Insecta) a. In some larvae, a hooked process on the distal inner margin of the maxillary mala, possibly a reminant of the lacinia. b. In Lepidoptera, a process of the 10th abdominal tergum overhanging… …   Dictionary of invertebrate zoology

  • uncus — 1. Any hook shaped process or structure. 2. The anterior, hooked extremity of the parahippocampal gyrus on the basomedial surface of the temporal lobe; the anterior face of the u. corresponds to the olfactory …   Medical dictionary

  • Uncus — Ụncus [aus lat. uncus, Gen.: unci = Haken, Widerhaken] m; , Ụnci: hakenförmige Hirnrindenvorwölbung am vorderen Ende des ↑Gyrus parahippocampalis (Anat.). Ụncus cọrporis: hakenförmiger Fortsatz am seitlichen Rand der Halswirbelkörper …   Das Wörterbuch medizinischer Fachausdrücke

  • Uncus — kabliukas statusas T sritis gyvūnų anatomija, gyvūnų morfologija atitikmenys: lot. Uncus ryšiai: platesnis terminas – uodžiamųjų smegenų kraštinė dalis …   Veterinarinės anatomijos, histologijos ir embriologijos terminai

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