sense of smell. detailed of the olfactory region

olfactory smell aroma odor scent fragrance nasal receptors nostrils brain neurons chemoreceptors molecules perception sensory bulb epithelium pathway detection identification memory flavor pheromones anosmia hyposmia hyperosmia olfaction airborne particles cavity signal transduction limbic system adaptation sensitivity environment sniffing volatile compounds gustatory taste integration stimulation fatigue neurogenesis pathology