vomeronasal organ


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Related to vomeronasal organ: Flehmen response

vo·mer·o·na·sal or·gan

[TA]
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.

vomeronasal organ

(vō′mə-rō-nā′zəl)
n.
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.

vomeronasal organ

a structure on each side of the nasal septum believed to be a chemical sensory center for "sixth sense" detection of pheromones, carried by the nervous terminalis.

Jacobson,

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.

vomeronasal organ

an organ thought to supplement the olfactory system in receiving pheromonic communication. The sensory part of the organ is in two long, thin sacs, situated on either side of the nasal septum at its base. The entrances to the sacs are from the incisive ducts which communicate with the nasal cavity and a pit in the roof of the mouth, just behind the dental pad or upper incisor teeth in horses. The function of the organ is probably related to the estrus-seeking action of flehmen. Called also organ of Jacobson.
References in periodicals archive ?
4: The shape of the opening of the vomeronasal organ on the right side of the septum according to gender.
5: The shape of the opening of the vomeronasal organ on the left side of the septum according to gender.
Prenatal develop- ment of the mammal; ian vomeronasal organ.
The vomeronasal organ of Jacobson in the human embryo and fetus.
Comparative morphology and histochemistry of glands associated with the vomeronasal organ in humans, mouse lemurs, and voles.
Androgen receptor distribution, PAS and Alcyan Blue reaction in the vomeronasal organ and the nasal septum mucosa of the developing male rat.
The role of the vomeronasal organs in the reproductive behavior of the adder Vipera berus.
Females urinate, and males put their nose over it to get the molecules into their vomeronasal organ," says Penny Bernstein, PhD, an associate professor of biological sciences at Kent State University's Stark Campus.
Surprisingly, the researchers found that surgically disabling the vomeronasal organ caused genetically normal adult females to exhibit the same suite of randy behaviors.
People lack the vomeronasal organ, relying instead on visual and behavioral cues to distinguish boys from girls.
EROX products are the only ones to incorporate synthesized human pheromones as a component and have been shown to stimulate the human vomeronasal organ (VNO).
If greater sizes or volumes are related to greater sense of acuity, then the size of the olfactory and the vomeronasal organs are indicative of an olfactory sense acuter than in most bat species.