<Tr> <Th> FMA </Th> <Td> 77280 </Td> </Tr> <Tr> <Td_colspan="2"> Anatomical terminology (edit on Wikidata) </Td> </Tr> <P> The vomeronasal organ (VNO), or the Jacobson's organ, is an auxiliary olfactory sense organ that is found in many animals . It lies close to the vomer and nasal bones . It was discovered by Frederik Ruysch prior to 1732 and later by Ludwig Jacobson in 1813 . This organ is the sense organ involved in the flehmen response in mammals . </P> <P> The VNO is the first stage of the accessory olfactory system and contains sensory neurons that detect chemical stimuli . The axons from these neurons project to the accessory olfactory bulb, which targets the amygdala and bed nucleus of the stria terminalis, which in turn project to the hypothalamus . </P>

The vomeronasal organ (vno) is a set of receptors located