Brodmann area 9
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203975475
2008-04-07T13:05:46Z
65.94.6.22
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[[image:Ba9.png|right|]]
==Human==
'''Brodmann area 9''', or BA9, is part of the [[frontal lobe|frontal]] [[cerebral cortex | cortex]] in the [[human brain]]. It contributes to the [[dorsolateral prefrontal cortex]].
==Guenon==
The term '''Brodmann area 9''' refers to a cytoarchitecturally defined portion of the frontal lobe of the [[guenon]]. Brodmann-1909 regarded it on the whole as topographically and cytoarchitecturally [[homology (biology)|homologous]] to the [[granular frontal area 9]] and [[frontopolar area 10]] in the human. Distinctive features (Brodmann-1905): unlike [[Brodmann area 6]]-1909, area 9 has a distinct internal granular layer (IV); unlike [[Brodmann area 6]] or [[Brodmann area 8]]-1909 its internal pyramdal layer (V) is divisible into two sublayers, an outer layer 5a of densely distributed medium sized [[ganglion cell]]s that partially merges with layer IV, and an inner, clearer, cell-poor layer 5b; the [[pyramidal cell]]s of sublayer 3b of the external [[pyramidal layer]] (III) are smaller and sparser in distribution; the external [[granular layer]] (II) is narrow, with small numbers of sparsely distributed [[granule cell]]s.
==External links==
* For Neuroanatomy of this area see [http://braininfo.rprc.washington.edu/Scripts/ancilcentraldirectory.aspx?ID=1046 BrainInfo]
It is the medial prefrontal cortex.
==See also==
* [[Brodmann area]]
* [[List of regions in the human brain]]
{{neuroanatomy-stub}}
{{Prosencephalon}}
[[Category:Brodmann areas|09]]
http://www.pnas.org/cgi/reprint/98/7/4259.pdf