Cerebral Cortex: Hemispheres and Lobes
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The cerebral cortex folds into two hemispheres connected by the corpus callosum, each divided into four lobes: frontal, parietal, temporal, and occipital.
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A split-brain patient whose corpus callosum is cut can pick up an object with one hand but not name it, depending on the field.
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Each hemisphere's functions are largely redundant with the other's, despite some being localized to one side.