The term olfactory cortex refers to a group of structures defined by histology and connectivity, namely, structures that receive axons from the main olfactory bulb. They include the anterior olfactory nucleus, the olfactory tubercle, the rostral part of the medial amygdalar nucleus ( anterior periamygdalar cortex ), and structures in the anterior parahippocampal gyrus, namely, the piriform cortex, most of the periamygdalar area, and the rostral part of the entorhinal cortex. It is a functional unit most commonly used in descriptions of the primate olfactory system ( Price-1990 Anthoney-1994 ). Note the difference between this set of structures and the combination referred to as olfactory areas (rodent). There the focus is on an overlapping set of structures earlier in the olfactory system, which includes the main olfactory bulb and accessory main olfactory bulb and excludes a more central structure, such as the entorhinal cortex, the accessory olfactory bulb, the anterior olfactory nucleus, the tenia tecta, the piriform cortex, the postpiriform transition area, the piriform amygdalar area, the nucleus of the olfactory tract, and the periamygdalar cortex (COA) ( Swanson-2004 ). Updated 7 Jun 2024.