Odor perception in mammals is a multistep process that begins when olfactory sensory neurons in the animal's nose detect an odor molecule and then transmit that sensory information as an electrical signal to the brain. The first brain area to receive these signals is the olfactory bulb, where the sensory neurons end in small structures called glomeruli. Olfactory cues trigger complex patterns of activity both in the olfactory sensory neurons and in the glomeruli within the brain. (source: biology.plosjournals.org)
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