area 24
Acronym: 24
The term area 24 refers to the part of cingulate cortex that is located largely in the anterior cingulate gyrus of the limbic lobe. In the human it forms an arc around the genu of the corpus callosum. Its outer border corresponds approximately to the cingulate sulcus. Cytoarchitecturally it is bounded internally by area 33, externally by area 32, caudally by area 23, and rostrally, beneath the genu of the corpus callosum, by area 25. It is equivalent to area 24 of Brodmann (human) ( Vogt-1995 ).
     In the macaque, area 24 is also located largely in the anterior cingulate gyrus. Its location relative to other cytoarchitecturally defined areas is similar to that of the human, except that it is bounded rostrally by area 32 and, since the macaque lacks an area 33, its inner boundary is directly with the corpus callosum. It is equivalent to area 24 of Brodmann-1909 (guenon) ( Vogt-1987 ).
     In both species it has three parts. In radial order, from the corpus callosum out, they are area 24a, area 24b, and area 24c. Each of those has three subdivisions corresponding to its intersection with the anterior cingulate cortex, the anterior midcingulate cortex, or the posterior midcingulate cortex. Altogether, authors list 12 divisions and subdivisions in the human, 9 in the macaque ( Vogt-2012 ).
     The description above corresponds to area 24 as a component of the cingulate cortex. Some authors consider parts of it as components of medial prefrontal cortex. Their segmentation in the human is similar ( Ongur-2003 ), but in the macaque is somewhat different ( Carmichael-1994 ). See area 24 (macaque). The nomenclature is confused, because authors use the term ' area 24 ' in referring both to the entire area and to the part restricted to the anterior cingulate cortex. The latter is designated area 24* in NeuroNames.
     Equivalents in the rat and mouse may be present in the anterior cingulate area of the rodent ( Swanson-2004; Hof-2000 ).

Also known as: No other name for this structure has appeared in PubMed.NeuroNames ID : 3541

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