Fornicate gyrus

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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 no longer considered meaningful.^{[citation needed]}

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v • d • e Human brain: Limbic system Diencephalon Hypothalamus · Mammillary body Telencephalon: limbic lobe Archicortex: Hippocampal formation (Hippocampus, Alveus of the hippocampus, Subiculum, Perforant path, Fimbria, Dentate gyrus) · Paraterminal gyrus · Supracallosal gyrus Cingulate gyrus · Parahippocampal gyrus · Uncus Telencephalon: other Amygdala · Nucleus accumbens · Orbitofrontal cortex septum: Septum pellucidum, Septal nuclei

v • d • e Brain: telencephalon (cerebrum, cerebral cortex, cerebral hemispheres) Frontal lobe Precentral gyrus (Primary motor cortex, 4) Superior frontal gyrus/Frontal eye fields (6, 8, 9), Middle frontal gyrus (46), Inferior frontal gyrus/Broca's area (44-Pars opercularis, 45-Pars triangularis) Orbitofrontal cortex (10, 11, 12, 47) Prefrontal cortex, Premotor cortex Precentral sulcus - Superior frontal sulcus - Inferior frontal sulcus - Olfactory sulcus Parietal lobe Somatosensory cortex (Primary (1, 2, 3, 43), Secondary (5)), Precuneus (7m) - Parietal operculum Parietal lobules (Superior (7l), Inferior (40)), Angular gyrus (39) Intraparietal sulcus, Marginal sulcus Occipital lobe Primary visual cortex (17), (Cuneus, Lingual gyrus, Lateral occipital gyrus (18, 19)) Calcarine fissure Temporal lobe Primary auditory cortex (41, 42), Superior temporal gyrus (38, 22/Wernicke's area), Middle temporal gyrus (21), Inferior temporal gyrus (20) Fusiform gyrus (37) Medial temporal lobe (Amygdala, Parahippocampal gyrus (27, 28, 34, 35, 36) Cingulate cortex/gyrus Subgenual area (25), Anterior cingulate (24, 32, 33), Posterior cingulate (23, 31), Retrosplenial cortex (26, 29, 30) Callosal sulcus Interlobar sulci/fissures lateral: Central (frontal+parietal), Lateral (frontal+parietal+temporal), Parietoöccipital medial: Medial longitudinal, Cingulate (frontal+cingulate), Collateral (temporal+occipital) White matter tracts Commissural fibers - Association fibers Internal capsule (Anterior limb, Genu, Posterior limb), Corona radiata, External capsule, Lamina terminalis, Extreme capsule, Semioval center Olfactory tract - Terminal stria - Diagonal band of Broca Other Insular cortex gray: Olfactory bulb, Anterior olfactory nucleus, Basal optic nucleus of Meynert, Substantia innominata, Anterior perforated substance Corpus striatum - Limbic lobe Some categorizations are approximations, and some Brodmann areas span gyri.