area 24
Acronym: 24
The term area 24 refers to a large area of cingulate cortex located in the anterior cingulate gyrus of the limbic lobe. It forms an arc around the genu of the corpus callosum, its inner border,. In humans its outer border extends horizontally along the superior frontal gyrus dorsal to the cingulate sulcus. It is a composite of three main subareas: area 24ab in anterior cingulate cortex (ACC); ; area a24' in anterior midcingulate cortex (aMCC), and area p24' in posterior midcingulate cortex (pMCC). 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 with its outer border the cingulate sulcus. 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, deep in the callosal sulcus. It is equivalent to area 24 of Brodmann (guenon) ( Vogt-1987 ).
     In the rat and mouse it is composed of area 24a and area 24b, which correspond to area 24ab in primates, and area 24a' and area 24b', which correspond to area a24' in the primate.
     According to this definition, area 24 is a component of cingulate cortex. Some authors refer to parts of it as belonging to NeuroNames' medial prefrontal cortex of Ongur. Their segmentation in the human is similar ( Ongur-2003 ), but in the macaque is somewhat different. See area 24 of Carmichael.
     The nomenclature is also somewhat confused because authors have used the term area 24 in reference both to the entire area and to the part located in anterior cingulate cortex. To avoid ambiguity, the smaller area is designated area 24* in NeuroNames.

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

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