vomeronasal organ

Also found in: Dictionary, Thesaurus, Acronyms, Encyclopedia, Wikipedia.
Related to vomeronasal organ: Flehmen response

vo·mer·o·na·sal or·gan

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.
Farlex Partner Medical Dictionary © Farlex 2012

vomeronasal organ

Either of two olfactory sense organs, found near the vomer in certain amphibians, reptiles, and mammals, that detect pheromones and other chemical compounds. In humans, these organs regress during fetal development. Also called Jacobson's organ.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


Ludwig L., Danish anatomist, 1783-1843.
Jacobson anastomosis - a portion of the tympanic plexus.
Jacobson canal - a minute canal in the wedge of bone separating the jugular canal and carotid canal. Synonym(s): tympanic canaliculus
Jacobson cartilage - a narrow strip of cartilage located between the lower edge of the cartilage of the nasal septum and the vomer. Synonym(s): cartilago vomeronasalis
Jacobson nerve - Synonym(s): tympanic nerve
Jacobson organ - a fine vestigial horizontal canal ending in a blind pouch in the mucous membrane of the nasal septum. Synonym(s): vomeronasal organ
Jacobson plexus - a plexus on the promontory of the labyrinthine wall of the tympanic cavity, formed by the tympanic nerve, an anastomotic branch of the facial nerve, and sympathetic branches from the internal carotid plexus. Synonym(s): tympanic plexus
Jacobson reflex - flexion of the fingers elicited by tapping the flexor tendons over the wrist joint or the lower end of the radius.
Medical Eponyms © Farlex 2012
References in periodicals archive ?
3: Visual shapes of the openings of the vomeronasal organ.
In the vomeronasal organ, cells with specific sensor molecules (red) detect an odor molecule and switch on (green) in response.
This conclusion is consistent with the results reported by Andren (1982) where application of Xylocaine tape to areas of the mouth, other than at the entrance to the vomeronasal organs, in adders (Vipera berus) had no effect on reproductive behaviors dependent upon tongue flicking such as the detection of the sex of a conspecific.
Ultrastructure of the human vomeronasal organ. J Steroid Biochem Mol Biol 1991;39:553-60.
& Hummel, T.Frequency and localization of the putative vomeronasal organ in humans in relation to age and gender.
Surprisingly, the researchers found that surgically disabling the vomeronasal organ caused genetically normal adult females to exhibit the same suite of randy behaviors.
The vomeronasal organ is connected directly to the parts of the brain that control social and sexual behavior.
Frank Zufall of the University of Maryland at College Park and his colleagues suspected that the answer lies in the vomeronasal organ (VNO), a small pit inside the nose that, in many animals, detects pheromones and other molecules important in reproduction.
Nepetalactone is absorbed by receptors on a cat's vomeronasal organ. Oddly enough, even cats without a sense of smell can respond to catnip, due no doubt to the unique location of this olfactory organ--in the front of the roof of your cat's mouth, above the palate.