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a sense organ for pheromones in lower animals, usually regresses after the sixth month of gestation in humans; of debatable functional significance in humans when it does exist in vestigal form; located in a small canal, ending in a blind pouch, in the mucous membrane of the nasal septum, beginning just behind and above the incisive canal.
The canal opening into the nasal septum. Synonym: organ of Jacobson
See also: organum