Organ located under the inner surface of the nasal cavity near the nasal septum, participating in the detection of semiochemicals.
An organ discovered in 1813 by Ludvig Jacobson, located beneath the inner surface of the nasal cavity near the nasal septum, present in mammals, including humans and reptiles, they participate in the detection of semiochemicals. At invertebrates its function is fulfilled by antennae; palps; tarses.