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olfactory system
The olfactory system is the sensory system used for olfaction, or the sense of smell. Most mammals and reptiles have two distinct parts to their olfactory system: a ''main olfactory system'' and an accessory olfactory system. The main olfactory system detects volatile, airborne substances, while the accessory olfactory system senses fluid-phase stimuli. Behavioral evidence indicates that most often, the stimuli detected by the accessory olfactory system are pheromones.
The olfactory system is often spoken of along with the gustatory system as the chemosensory senses because both transduce chemical signals into perception.
==Function==
The mechanism of the olfactory system can be divided into a peripheral one, sensing an external stimulus and encoding it as an electric signal in neurons, and a central one, where all signals are integrated and processed in the central nervous system.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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