- Brodmann area 23
Brodmann area 23 (BA23) is a region in the
braincorresponding to some portion of the posterior cingulate cortex. It lies between Brodmann area 30and Brodmann area 31and is located on the medial wall of the cingulate gyrusbetween the callosal sulcusand the cingulate sulcus.
This area is also known as ventral posterior cingulate area 23. It is a subdivision of the cytoarchitecturally defined
cingulate regionof cerebral cortex. In the human it occupies most of the posterior cingulate gyrusadjacent to the corpus callosum. At the caudal extreme it is bounded approximately by the parieto-occipital sulcus. Cytoarchitecturally it is bounded dorsally by the dorsal posterior cingulate area 31, rostrally by the ventral anterior cingulate area 24, and ventrorostrally in its caudal half by the retrosplenial region(Brodmann-1909).
Brodmann area 23 is a subdivision of the cerebral cortex of the
guenondefined on the basis of cytoarchitecture. Brodmann regarded it as topographically and cytoarchitecturally homologous to the combined ventral posterior cingulate area 23 and dorsal posterior cingulate Brodmann area 31of the human (Brodmann-1909). Distinctive Features (Brodmann-1905): the cortex is relatively thin; smaller cells predominate; the cell density of the multiform layer(VI) is great, producing a distinct boundary with the subcortical white matter; the internal granular layer(IV) is rather well developed; the internal pyramidal layer(V) contains a dense population of round, medium-sized ganglion cells concentrated at the border with layer IV; layers V and VI are narrow with a distinct mutual boundary.
macaquethe researchers Bonin and Bailey describe an area they term LC which is in agreement with Brodmann area 23. The LC area : "covers the posterior part of the cingulate gyrus and extends into the cingulate sulcus where, on the inferior wall, it is continuous with the frontal cortex FDL" [ Gerhardt von Bonin, Percival Bailey, "The Neocortex of Macaca Mulatta", 1947.] .
The area has been subdivided further: In the
macaque( Macaca fascicularis) the following subdivisions have been suggested [Y. Kobayashi, D. G. Amaral, " Journal of Comparative Neurology", 426:339+] :
* 23i (internal)
* 23e (external)
* 23v (ventral), the most caudalventral (inferior) portion and with most highly developed layer IV.
Another suggestion is for
macaque( Macaca mulatta) [Brent A. Vogt, D. N. Pandya, D. L. Rosene, " Cingulate cortex of the rhesus monkey: I. Cytoarchitecture and thalamic afferents", " Journal of Comparative Neurology", 262(2):256-270.]
* 23a, adjacent to the
callosal sulcusthus closest to Brodmann area 30.
Further division of 23b is [H. Shibata, M. Yukie, "Differential thalamic connections of the posteroventral and dorsal posterior cingulate gyrus in the monkey". "
European Journal of Neuroscience".] .
* pv23b, posteroventral part for 23b, main thalamic projections from anterior nuclei.
* d23b, dorsal part of 23b, weak connections from the anterior nuclei.
List of regions in the human brain
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