Brodmann area 18
Brodmann area 18, or BA18, is part of the occipital cortex in the human brain.It is known as a "Visual Association Area" or V2 and is a first stage in processing or feature extraction of retinotopic images from V1.It is a subdivision of the cytoarchitecturally defined occipital region of cerebral cortex.Brodmann area 18 is a subdivision of the cerebral cortex of the guenon defined on the basis of cytoarchitecture.Distinctive features (Brodmann-1905): a wide, dense internal granular cell layer (IV); a distinct sublayer 3b of closely packed large pyramidal cells positioned in the external pyramidal layer (III) directly above layer IV; an almost cell-free, narrow internal pyramidal layer (V) with no larger ganglion cells; a very narrow, dense multiform layer (VI) composed of small polymorphic cells that form a distinct boundary with the underlying subcortical white matter.