The term glomerular layer of the main olfactory bulb refers to one of five layers of the main olfactory bulb in the mouse ( Dong-2004 ) and the rat ( Swanson-2004 ). The other four are the outer plexiform layer of the main olfactory bulb, the mitral layer of the main olfactory bulb, the inner plexiform layer of the main olfactory bulb and the granule cell layer of the main olfactory bulb.