Humans still carry a vestigial organ once used to detect pheromones
Humans possess a vestigial vomeronasal organ in the nasal septum that once detected pheromones, though evolutionary changes have rendered the structure non-functional in modern humans.
The vomeronasal organ, or Jacobson's organ, is a crescent-shaped lumen found in the nasal septum of roughly 30% of adults. While animals like cats and snakes use this organ to trigger the flehmen response for mating and hunting, the human version is considered a biological relic.
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