Everything about Brodmann Area 24 totally explained
Brodmann area 24 is part of the
anterior cingulate in the
human brain.
Human
In the human this area is known as
ventral anterior cingulate area 24, and it refers to a subdivision of the
cytoarchitecturally defined
cingulate cortex region of
cerebral cortex (area
cingularis anterior ventralis). It occupies most of the
anterior cingulate gyrus in an arc around the
genu of
corpus callosum. Its outer border corresponds approximately to the
cingulate sulcus. Cytoarchitecturally it's bounded internally by the
pregenual area 33, externally by the
dorsal anterior cingulate area 32, and caudally by the
ventral posterior cingulate area 23 and the
dorsal posterior cingulate area 31.
Francis Crick, one of the discoverers of
DNA, listed area 24 as the seat of free will because of its centrality in
abulia and amotivational syndromes .
Guenon
In the
guenon this area is referred to as
area 24 of Brodmann-1905. It includes portions of the
cingulate gyrus and the
frontal lobe. The
cortex is thin; it lacks the internal
granular layer (IV) so that the densely distributed, plump
pyramidal cells of sublayer 3b of the external
pyramidal layer (III) merge with similar cells of the internal pyramidal layer (V); the multiform layer (VI) is very thin (Brodmann-1905). Note that Brodmann later divided this area into two areas, area 24 of Brodmann-1909 and
area 25 of Brodmann-1909 (Brodmann-1909).
Subdivisions
The area has been subdivided further, and Vogt et al. make three division for the area in the
rhesus monkey (
Macaca mulatto):
- 24a: "adjacent to the callosal sulcus"
- 24b: "has more clearly defined layers II, III, and Va"
- 24c: "the lower bank of the anterior cingulate sulcus"
External links and references
For a list of Brodmann areas visit http://spot.colorado.edu/~dubin/talks/brodmann/neuronames.htmlFurther Information
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