Brodmann area 23

Brodmann area 23 (BA23) is a region in the brain corresponding to some portion of the posterior cingulate cortex. It lies between Brodmann area 30 and Brodmann area 31 and is located on the medial wall of the cingulate gyrus between the callosal sulcus and the cingulate sulcus.

The area has been subdivided further: In the macaque (Macaca fascicularis) the following subdivisions have been suggested¹:

• 23i (internal)
• 23e (external)
• 23v (ventral), the most caudalventral (inferior) portion and with most highly developed layer IV.

An other suggestion is for macaque (Macaca mulatta)²

• 23a, adjacent to the callosal sulcus thus closest to Brodmann area 30.
• 23b
• 23c

Further division of 23b is³.

• pv23b, posteroventral part for 23b, main thalamic projections from anterior nuclei.
• d23b, dorsal part of 23b, weak connections from the anterior nuclei.

References

1. Kobayashi Y, Amaral DG. JCompNeurol 426:339+
2. Vogt BA, Pandya DN, Rosene DL. Cingulate cortex of the rhesus monkey: I. Cytoarchitecture and thalamic afferents. Journal of Comparative Neurology 262(2):256-270
3. Shibata H, Yukie M. Differential thalamic connections of the posteroventral and dorsal posterior cingulate gyrus in the monkey. European Journal of Neuroscience