The cortex is a thin sheet of interconnected neurons that form a layer a few millimeters thick and covering the irregular surface of the cerebral hemispheres. The surface of each hemisphere has a set of bumps and grooves (or fissures) that provide an appearance folded cortex, such that only a third of this is exposed to the surface.
Three of these fissures serve to demarcate certain areas of the brain. They are: 1) s urco or central sulcus , 2) lateral sulcus or Sylvian fissure , and 3) parietooccipital sulcus . Eminences located between the grooves are called convolutions or pleats. The anterior central gyrus is ahead of the central sulcus, and the posterior central gyrus is placed immediately behind the central sulcus.Each hemisphere is divided into four lobes: frontal, parietal, temporal and occipital . In general, the lobes are positioned under the bones of the same name. Thus, the frontal lobe lies in the depths of the frontal bone, the parietal lobe below the parietal bone, temporal lobe below the temporal bone and the occipital lobe below the region corresponding to the occipital protuberance.grooves or fissures above act as neighboring structures among some of the cerebral lobes. The central sulcus is located between the frontal and parietal lobes. The lateral sulcus separates the temporal lobe beneath the frontal and parietal lobes above them. Parietooccipital groove can be displayed on the central surface of the brain.
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