The human cerebrum consists of two cerebral hemispheres.
The left and right hemispheres are broad, complementary divisions of the cerebrum. Each contains a cerebral cortex and underlying white matter, and each is commonly described as having frontal, parietal, temporal, and occipital lobes. A fifth, deep lobe called the insula is also recognized in modern anatomical descriptions.
The hemispheres are not completely independent. They communicate through bundles of nerve fibers, especially the corpus callosum, allowing information and coordinated actions to pass between them. Some functions are lateralized, meaning one side tends to contribute more strongly, but popular claims that people are simply “left-brained” or “right-brained” are misleading.
Most motor pathways cross, so the left hemisphere generally controls the right side of the body and the right hemisphere generally controls the left. Sensory and cognitive functions also involve extensive cooperation between both sides.