Brodmann area 9 524226 203975475 2008-04-07T13:05:46Z 65.94.6.22 /* External links */ [[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