Fornicate gyrus
The fornicate gyrus is a gyrus of the cerebral cortex, located on the medial surface adjacent to the corpus callosum. It is named for the fornix, a tract of white matter that runs beneath its surface roughly in a loop, from the amygdala to the mamillary bodies. It consists of the cingulate gyrus and the parahippocampal gyrus.
Because the central sulcus that separates the frontal lobe from the parietal lobe stops when it reaches the cingulate gyrus, and because the fornicate gyrus is functionally distinct from adjacent areas of the frontal and parietal lobes, the fornicate gyrus is sometimes regarded as a separate lobe of the brain; as such it called the limbic lobe because it is part of the limbic system. However, the limbic association cortex extends beyond this gyrus, and the term "limbic lobe" is not universally used.
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