![]() ![]() 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. Anteriorly the corpus callosum is folded back to form the genu.
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