The olfactory bulb is divided into two different structures: the main olfactory bulb, and the accessory olfactory bulb. The main olfactory bulb has a multi-layered cellular architecture made up of the glomerular layer, external plexiform layer, mitral cell layer,internal plexiform layer, granule cell layer. the glomerular layer receives direct input from olfactory nerves, which consist of axons from approximately ten million olfactory receptor neurons in the olfactory mucosa, a region of the nasal cavity.
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