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Brodmann area 12 is a subdivision of the cerebral cortex of the guenon defined on the basis of cytoarchitecture. It occupies the most rostral portion of the frontal lobe. Brodmann-1909 did not regard it as homologous, either topographically or cytoarchitecturally, to rostral area 12 of the human. Distinctive features (Brodmann-1905): a quite distinct internal granular layer (IV) separates slender pyramidal cells of the external pyramidal layer (III) and the internal pyramidal layer (V); the multiform layer (VI) is expanded, contains widely dispersed spindle cells and merges gradually with the underlying cortical white matter; all cells, including the pyramidal cells of the external and internal pyramidal layers are inordinately small; the internal pyramidal layer (V) also contains spindle cells in groups of two to five located close to its border with the internal granular layer (IV).
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See also
| Brain: telencephalon (cerebrum, cerebral cortex, cerebral hemispheres) |
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| 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 |
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| 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 |
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| Occipital lobe | Primary visual cortex (17), (Cuneus, Lingual gyrus, Lateral occipital gyrus (18, 19))
Calcarine fissure |
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| 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) |
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| Cingulate cortex/gyrus | Subgenual area (25), Anterior cingulate (24, 32, 33), Posterior cingulate (23, 31), Retrosplenial cortex (26, 29, 30)
Callosal sulcus |
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| Interlobar sulci/fissures | lateral: Central (frontal+parietal), Lateral (frontal+parietal+temporal), Parietoöccipital
medial: Medial longitudinal, Cingulate (frontal+cingulate), Collateral (temporal+occipital) |
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| 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 |
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| Other | Insular cortex
gray: Olfactory bulb, Anterior olfactory nucleus, Basal optic nucleus of Meynert, Substantia innominata, Anterior perforated substance
Corpus striatum - Limbic lobe |
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| Some categorizations are approximations, and some Brodmann areas span gyri. |
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