The post central (sensory) area (= somaesthetic area) lies in the parietal lobe immediately posterior to the central sulcus. The nerve cells are called pyramidal cells which initiate the contraction of voluntary muscles. The pre-central (motor) area lies in the frontal lobe immediately anterior to the central sulcus. Thus the associated areas are involved in memory, learning and reasoning, They interpret the input, store the input and initiate a response in light of similar past experience. They receive impulses from the receptors. In each cerebral hemisphere, there are present three types of functional areas: The parieto-occipital sulcus separates the parietal lobe from the occipital lobe. The lateral sulcus separates the frontal lobe from the temporal lobe.
The central sulcus separates the frontal lobe from the parietal lobe. Each cerebral hemisphere of the cerebrum is divided into four lobes: frontal, parietal, temporal and occipital lobes. Hence they are collectively called White matter.Ī very deep fissure, the longitudinal fissure, separates the two cerebral hemispheres. The large concentration of medullated nerve fibres gives this tissue an opaque white appearance. The upward folds, or gyri (sing, gyrus), alternate with the downward grooves, or sulci (sing, sulcus).īeneath the grey matter there are present millions of medullated nerve fibres, connecting the neurons of the cerebral cortex with those located elsewhere in the brain. The surface of the cortex is greatly folded. The outer portion of cerebrum is called the cerebral cortex that makes up the grey matter of the cerebrum. Left cerebral hemisphere is smaller than the right. The fornix is a paired structure, one of which is present in each hemisphere. Posteriorly the corpus callosum curves ventrally to form rounded splenium which joins a fibrous strip called fornix. Please re-read this policy prior to submitting any personal information if you have concerns about how your information is being collected and used.Anteriorly the corpus callosum is folded back to form the genu. Note that this policy may be revised periodically without notice. If any of these sites are found to contain irrelevant or offensive information, please contact us.īy using, you signify your agreement to our privacy policy as stated above. However, the HCP website is not responsible for maintaining or updating the content of these other sites. This website contains links to other websites whose content we think is relevant. This is a standard practice for most websites, and this data is never linked with personally identifiable information. This information is only used for diagnostic or debugging purposes, to help us optimize our website's performance, and is not shared externally. Our website may also collect non-personal data about site visits, sessions, and IP addresses.
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