it tells you about vomeronasal organ

1. resenatation
omeronasal
rgan
Nderguidance
rof. Zaichenko
Alexander
Ivanovich

3.  The vomeronasal organ (VNO), or the Jacobson's
organ ( latin - organum vomeronasale)
 auxiliary olfactory sense organ - animals.
 It lies close to the vomer and nasal bones.
 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.

5. In
Humans

6. The Vomeronasal organ
(VNO) is located in the nasal
cavity on either side of the
nasal septum in humans and
animals. It can also be
located near the roof of the
mouth in some animals.

9. The vomeronasal organ is
very well developed in
snakes, lizards and mice.

11.  VNO -base of the nasal cavity.
 Divided by the nasal septum, C-shaped, or crescent, lumen.
 The vomeronasal receptor neurons possess axons which travel from the VNO to the
accessory olfactory bulb (AOB) or, as it's also known, the vomeronasal bulb.
 sensory receptors located on the medial concave surface of the crescent lumen. The
lateral, convex surface of the lumen is covered with non-sensory ciliated cells, where the
basal cells are also found.
 At the dorsal and ventral aspect of the lumen are vomeronasal glands, which fill the
vomeronasal lumen with fluid
 . Sitting next to the lumen are blood vessels that dilate or constrict, forming a vascular
pump that deliver stimuli to the lumen. A thin duct, which opens onto the floor of the nasal
cavity inside the nostril, is the only way of access for stimulus chemicals.
 During embryological development, the vomeronasal sensory neurons form from the nasal
(olfactory) placode, at the anterior edge of the neural plate (cranial nerve zero).

13. Detects chemical
compounds contained
within scents.
Specifically chemical-
communication signals
(pheromones)

15.  The flehmen response is a behaviour whereby an animal
curls back its upper lips exposing its front teeth, inhales
with the nostrils usually closed and then often holds this
position for several seconds.
 It may be performed over a site or substance of particular
interest to the animal (e.g. urine or faeces) or may be
performed with the neck stretched and the head held high
in the air.
 Flehmen is performed by a wide range of mammals
including ungulates and felids. The behaviour facilitates
the transfer of pheromones and other scents into the
vomeronasal organ located above the roof of the mouth via
a duct which exits just behind the front teeth of the
animal.

16. Identifying reproductive
status
Reproductive synchrony

18.  http://www.neuro.fsu.edu/faculty/mmered/vomer/human.htm
 http://chemse.oxfordjournals.org/cgi/content/full/26/4/433
 http://www.abc.net.au/science/articles/2001/05/11/29241
3.htm?site=science/greatmomentsinscience
 Pure Instinct Perfume
• STRUCTURE AND FUNCTION OF THE VOMERONASAL
ORGAN, KJELL B. DØVING1,* ANDDIDIER TROTIER
• http://serendip.brynmawr.edu/bb/neuro/neuro99/web3/Bernstein.htm
l

19. Made By :-
Abhijeet Kumar Srivastava
And
Shubham Arora