isthmus of the cingulate gyrus
Acronym: ICgG
The term isthmus of the cingulate gyrus refers to one of three components of the cingulate gyrus in the human and the macaque. The others are the anterior cingulate gyrus and the posterior cingulate gyrus ( Carpenter-1983 ). Identified by dissection it is a small convolution on the mesial aspect of the cerebral hemisphere.
     In curving around the splenium of the corpus callosum it connects the posterior cingulate gyrus dorsally with the parahippocampal gyrus ventrally. In some cases it is partially separated from the parahippocampal gyrus by the anterior calcarine sulcus, which also separates it from the lingual gyrus caudally ( Duvernoy-1992 ).
     Its location in the macaque is similar except that its caudal boundary is with the cuneus and is less well defined ( Martin-2000 ). Equivalent structures are not found in the smooth cerebral cortex of the rat or mouse ( NeuroNames ).

Also known as: isthmus, isthmus of cingulate gyrus, Isthmus-2NeuroNames ID : 163

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