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At the anatomical level, the olfactory system is composed of two structures, the main olfactory system whose stimulation induces sensations of smell and the trigeminal system that induces somatosensory sensations (tactile, thermal, pain, humidity). There is a third part called "vomeronasal organ", which is set back in the opening of the nostrils. In humans, the vomeronasal organ remains in a rudimentary state because its afferents nerve disappears from the 18th week of the embryonic life.