lobesclick to enlarge photograph
The cerebrum is the largest and most recognizable of the brain's structures. It is made up of a highly folded outer layer, called the cerebral cortex, and an inner layer rich in nerve fibers, which carry signals from the cortex to targets in other parts of the body. The cerebrum is divided into right and left hemispheres, with a bundle of fibers called the corpus callosum connecting and aiding in communication between the two halves. Each hemisphere can be divided further into four functionally distinct lobes: frontal, parietal, occipital, and temporal.