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The olfactory bulb in vertebrates lies at the very front of the brain, and is responsible for processing information from olfactory receptors in the nose. The bulb has two parts, the ‘’main olfactory bulb’’ (MOB) and the ‘’accessory olfactory bulb’’ (AOB). Nerve fibres from the vomeronasal organ (Jacobson’s organ), a chemosensitive organ at the base of the nasal cavity innervate the accessory olfactory bulb whereas the olfactory nerves terminate in the MOB. The cellular architecture and synaptic organisation are similar in the two parts of the bulb, but the laminar organisation in the accessory olfactory bulb is less distinct. The output from the olfactory bulb is carried by the axons of the "principal neurones", the mitral and tufted cells, in the lateral olfactory tract.