Brodmann area 18 524261 209662693 2008-05-02T10:04:18Z CommonsDelinker 2304267 Replacing [[Image:Ba_17_18_19.png]] with [[Image:Brodmann_areas_17_18_19.png]] (by [[commons:User:Siebrand|Siebrand]] because: Was in category "Duplicate", exact duplicate). [[image:Brodmann_areas_17_18_19.png|thumb|256px|Brodmann area 18 is shown in orange in this image which also shows ares 17 (red) and 19 (yellow)]] ==Human== '''Brodmann area 18''', or BA18, is part of the [[occipital lobe|occipital]] [[cerebral cortex | cortex]] in the [[human brain]]. It accounts for the bulk of the volume of the occipital lobe. This area is also known as parastriate area 18. It is a subdivision of the [[cytoarchitecture|cytoarchitecturally]] defined [[occipital region]] of [[cerebral cortex]]. In the human it is located in parts of the [[cuneus]], the [[lingual gyrus]] and the [[lateral occipital gyrus]] (H) of the [[occipital lobe]]. Cytoarchitecturally it is bounded on one side by the [[striate area 17]], from which it is distinguished by absence of a [[band of Gennari]], and on the other by the [[peristriate area 19]] (Brodmann-1909). ==Guenon== '''Brodmann area 18''' is a subdivision of the cerebral cortex of the [[guenon]] defined on the basis of cytoarchitecture. It is topographically and cytoarchitecturally [[homology (biology)|homologous]] to parastriate area 18 of the human (Brodmann-1909). Distinctive features (Brodmann-1905): a wide, dense internal [[granular cell]] layer (IV); a distinct sublayer 3b of closely packed large [[pyramidal cell]]s positioned in the external [[pyramidal layer]] (III) directly above layer IV; an almost cell free, narrow internal pyramidal layer (V) with no larger [[ganglion cell]]s; a likewise very narrow, dense [[multiform layer]] (VI) composed of small [[polymorphic cell]]s that form a distinct boundary with the underlying subcortical [[white matter]]. Like [[area 17 of Brodmann]]-1905, area 18 is relatively thin; the three deep layers are thin relative to the three outer layers; distinct boundaries between layers; abundance of [[granule cell]]s; narrow layer VI; and sharp boundary between cortex and subcortical white matter. ==External links== * For Neuroanatomy of the parastriate area 18 visit [http://braininfo.rprc.washington.edu/Scripts/ancilcentraldirectory.aspx?ID=417 BrainInfo] * For Neuroanatomy of Brodmann area 18 visit [http://braininfo.rprc.washington.edu/Scripts/ancilcentraldirectory.aspx?ID=1051 BrainInfo] ==See also== * [[Brodmann area]] * [[List of regions in the human brain]] {{neuroanatomy-stub}} {{Prosencephalon}} [[Category:Brodmann areas|18]]