Brodmann area 9

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Brain: Brodmann area 9
Brodmann area 9.png
Brodmann Cytoarchitectonics 9.png
Latin Area frontalis granularis
NeuroLex ID birnlex_1740

Brodmann area 9, or BA9, is part of the frontal cortex in the brain of humans and other primates. It contributes to the dorsolateral and medial prefrontal cortex.

Guenon[edit]

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 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 pyramidal layer (V) is divisible into two sublayers, an outer layer 5a of densely distributed medium-size 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.[1]

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  1. ^  This article incorporates text from this source, which is licensed under CC-BY 3.0.

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