The term olfactory epithelium (OLE) refers to the parts of the mucous membrane lining the nasal cavity that contain the olfactory receptors (OLR) of the olfactory system (OSY). The more numerous main olfactory receptor neurons (ORNm) are located in the OLE that lines the underside of the cribriform plate, the thin bony structure that separates the nasal cavity below from the cranial cavity above ( Price-1990 ). Less numerous are the accessory olfactory receptor neurons (ORNa). Their cell bodies are located in the vomeronasal organ (VNO) where they are embedded in the OLE of the nasal septum rostral to the ORNm's ( Barral-2009 ). Final 23 Dec 2024.