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Definition of CEREBRAL HEMISPHERE. : either of the two hollow convoluted lateral halves of the cerebrum â see brain illustration.
Cerebral Cortex The cerebral cortex is the outer surface of the cerebral hemispheres. It is the highest level of the brain and has about 20 billion neurons in the human brain which carry out the highest levels of mental functioning. The cerebral cortex is a layer of grey matter up to about 1/2 cm thick.Figure 3-2d shows a cross section of the cerebral hemispheres with the cortex shown as the pink layer on their outer surface.Figure 4-2d shows a highly magnified slice through the cortex. It is stained with a dye that colors (only) the cell bodies of neurons and glia blue.igure 3-2d shows a cross section of the cerebral hemispheres with the cortex shown as the pink layer on their outer surface. Figure 4-2d shows a highly magnified slice through the cortex. It is stained with a dye that colors (only) the cell bodies of neurons and glia blue.