- Brodmann area 9
Brodmann area 9, or BA9, is part of the frontal cortex in the
human brain. It contributes to the dorsolateral prefrontal cortex.
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 homologous to the granular frontal area 9and frontopolar area 10in the human. Distinctive features (Brodmann-1905): unlike Brodmann area 6-1909, area 9 has a distinct internal granular layer (IV); unlike Brodmann area 6or Brodmann area 8-1909 its internal pyramdal layer (V) is divisible into two sublayers, an outer layer 5a of densely distributed medium sized ganglion cells that partially merges with layer IV, and an inner, clearer, cell-poor layer 5b; the pyramidal cells 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 cells.
* For Neuroanatomy of this area see [http://braininfo.rprc.washington.edu/Scripts/ancilcentraldirectory.aspx?ID=1046 BrainInfo] It is the medial prefrontal cortex.
List of regions in the human brain
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