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Among lizards there is large morphological variation in olfactory organs, particularly the Jacobson's organ or the site of sensory epithelial tissue (Parsons, 1970).
Inside the mouth, the tongue transfers scent particles to the Jacobson's organ, two pits on the mouth roof; the organ sends complex signals to the brain, which analyzes the scent chemicals.
If pheromones are barcodes, then Jacobson's organ is the scanner - two teeny- tiny tubes inside the nose, first identified 200 years ago by anatomist Ludwig Jacobson.