Brodmann area 21
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[[image:Ba21.png|right|]]
==Human==
'''Brodmann area 21''', or BA21, is part of the [[temporal lobe|temporal]] [[cerebral cortex | cortex]] in the [[human brain]]. The region encompasses most of the lateral temporal cortex, a region believed to play a part in auditory processing and language. Language function is left lateralized in most individuals. BA21 is superior to [[Brodmann area 20|BA20]] and inferior to [[Brodmann area 40|BA40]] and [[Brodmann area 41|BA41]].
This area is also known as '''middle temporal area 21'''. It is a subdivision of the [[cytoarchitecture|cytoarchitecturally]] defined [[temporal region]] of cerebral cortex. In the human it corresponds approximately to the [[middle temporal gyrus]]. It is bounded rostrally by the [[temporopolar area 38]] (H), ventrally by the [[inferior temporal area 20]], caudally by the [[occipitotemporal area 37]] (H), and dorsally by the [[superior temporal area 22]] (Brodmann-1909).
==Guenon==
'''Brodmann area 21''' is a subdivision of the cerebral cortex of the [[guenon]] defined on the basis of cytoarchitecture. It is cytoarchitecturally homologous to the middle temporal area 21 of the human (Brodmann-1909). Distinctive features (Brodmann-1905): Compared to [[area 20 of Brodmann]]-1909, the total cortical thickness of area 21 is greater, the [[granular cell]]s are less abundant, and the boundary with the subcortical [[white matter]] is less distinct; the [[molecular layer]] (I) is wider; the [[pyramidal cell]]s of sublayer 3b of the external [[pyramidal layer]] (III) are larger; the internal [[granular layer]] (IV) is less developed and contains fewer cells; [[ganglion cell]]s of the internal pyramidal layer (V) are larger, rounder, and densely arrayed adjacent to layer IV; the boundary between layer V and the [[multiform layer]] (VI) is indistinct; and layer VI is wider and has no sublayers.
==External links==
* For Neuroanatomy of the '''middle temporal area 21''' visit [http://braininfo.rprc.washington.edu/Scripts/ancilcentraldirectory.aspx?ID=73 BrainInfo]
* For Neuroanatomy of '''Brodmann area 21''' visit [http://braininfo.rprc.washington.edu/Scripts/ancilcentraldirectory.aspx?ID=1054 BrainInfo]
==See also==
* [[Brodmann area]]
* [[List of regions in the human brain]]
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{{Prosencephalon}}
[[Category:Brodmann areas|21]]