Brodmann area 24 is part of the

anterior cingulate In the human brain, the anterior cingulate cortex (ACC) is the frontal part of the cingulate cortex that resembles a "collar" surrounding the frontal part of the corpus callosum. It consists of Brodmann areas 24, 32, and 33. It is involved i ...

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 Cytoarchitecture (Ancient Greek language, Greek ''wiktionary:κύτος#Ancient_Greek, κύτος''= "cell" + ''wiktionary:ἀρχιτέκτων#Ancient_Greek, ἀρχιτεκτονική''= "architecture"), also known as cytoarchitectonics, is th ...

defined

cingulate cortex The cingulate cortex is a part of the brain situated in the medial aspect of the cerebral cortex. The cingulate cortex includes the entire cingulate gyrus, which lies immediately above the corpus callosum, and the continuation of this in the ci ...

region of cerebral cortex (area cingularis anterior ventralis). It occupies most of the anterior cingulate gyrus in an arc around the

genu of the corpus callosum The corpus callosum (Latin for "tough body"), also callosal commissure, is a wide, thick nerve tract, consisting of a flat bundle of commissural fibers, beneath the cerebral cortex in the brain. The corpus callosum is only found in placental mam ...

. Its outer border corresponds approximately to the cingulate sulcus. Cytoarchitecturally it is bounded internally by the

pregenual area 33 Brodmann area 33, also known as pregenual area 33, is a subdivision of the cytoarchitecturally defined cingulate region of cerebral cortex. It is a narrow band located in the anterior cingulate gyrus adjacent to the supracallosal gyrus in the dept ...

, externally by the

dorsal anterior cingulate area 32 The Brodmann area 32, also known in the human brain as the dorsal anterior cingulate area 32, refers to a subdivision of the cytoarchitecturally defined cingulate cortex. In the human it forms an outer arc around the anterior cingulate gyrus. Th ...

, and caudally by the ventral posterior cingulate area 23 and the dorsal posterior cingulate area 31.

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 cell Pyramidal cells, or pyramidal neurons, are a type of multipolar neuron found in areas of the brain including the cerebral cortex, the hippocampus, and the amygdala. Pyramidal neurons are the primary excitation units of the mammalian prefrontal cor ...

s 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.

Brent A. Vogt Brent may refer to: *Brent (name), an English given and surname Place name ;In the United States *Brent, Alabama *Brent, Florida * Brent, Georgia *Brent, Missouri, a ghost town *Brent, Oklahoma ;In the United Kingdom * Brent, Cornwall *Brent ...

, Deepak N. Pandya, Douglas L. Rosene, "Cingulate cortex of the rhesus monkey: I. Cytoarchitecture and thalamic afferents," ''

The Journal of Comparative Neurology ''The Journal of Comparative Neurology'' is a peer-reviewed scientific journal that focuses on neuroscience and related fields, but specifically does not deal with Clinical medicine, clinical aspects of them. It was established in 1891 and is publ ...

'', 262(2):256-270, 1987 . distinguish three divisions of the area in the

rhesus monkey The rhesus macaque (''Macaca mulatta''), colloquially rhesus monkey, is a species of Old World monkey. There are between six and nine recognised subspecies that are split between two groups, the Chinese-derived and the Indian-derived. Generally b ...

(''Macaca mulatta''): * 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"

Image

File:Brodmann area 24 animation small.gif, Animation. File:Brodmann area 24 medial.jpg, Medial view.

Notes

External links