The term main olfactory sensory neuron (OSNm) refers to one of two types of olfactory sensory neurons in the human ( Buck-2013 ), macaque ( Price-2004 ), rat ( Swanson-2004 ) and mouse ( Hof-2000 ). The other is the accessory olfactory sensory neuron (OSNa). For more information on OSNm's, see main olfactory receptor neuron (OLRm). Final 17 Jan 2025.