Three-dimensional visualization of the cerebral cortex reconstructed from scanned human data. The cerebral cortex, the outermost portion of the brain, can be divided into regions depending on function. Depicted here is the region dedicated to smell, located on the medial aspects of the cerebral hemispheres just anterior to the eyes and nose. The special sensory organs of smell, the olfactory bulbs, are located in the anterior aspect of the nasal cavity. They receive chemical information from the odor molecules which circulate in air below and send the signals to the cerebral cortex to be processed.