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* Vomeronasal organ is an '''accessory olfactory''' organ.
* Vomeronasal organ is an '''accessory olfactory''' organ.
* Connected to two small openings in the anterior roof of the mouth just behind the upper [[Lips|lip]].
* Connected to two small openings in the anterior roof of the mouth just behind the upper [[Lips|lip]].
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* Fluid-borne, less volatile chemicals enter the vomeronasal organ through the [[Alimentary_-_Anatomy_%26_Physiology#Oral_Cavity|oral cavity]] by means of nasopalatine (incisive) ducts.
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* Fluid-borne, less volatile chemicals enter the vomeronasal organ through the [[Alimentary_- Anatomy & Physiology#Oral_Cavity|oral cavity]] by means of nasopalatine (incisive) ducts.
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[[Image:Flehmen Response Horse.jpg|thumb|right|150px|<p>The Flehmen Response in the Horse</p><sup> Courtesy of Anna Schultz.</sup>]]
[[Image:Flehmen Response Horse.jpg|thumb|right|150px|<p>The Flehmen Response in the Horse</p><sup> Courtesy of Anna Schultz.</sup>]]
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* Some [[Reproductive_Behaviour_-_Attractivity_Behaviour_-_Anatomy_%26_Physiology#Pheramones|pheromones]] are less volatile and need to be detected by the '''vomeronasal organ'''.
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* Some [[Reproductive_Behaviour_-_Attractivity_Behaviour_- Anatomy & Physiology#Pheramones|pheromones]] are less volatile and need to be detected by the '''vomeronasal organ'''.
** Bull, ram, stallion, some extent the boar.
** Bull, ram, stallion, some extent the boar.
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* Male closely approaches the source of [[Reproductive_Behaviour_-_Attractivity_Behaviour_-_Anatomy_%26_Physiology#Pheramones|pheromones]] and will nuzzle the female genital region.
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* Male closely approaches the source of [[Reproductive_Behaviour_-_Attractivity_Behaviour_- Anatomy & Physiology#Pheramones|pheromones]] and will nuzzle the female genital region.
* Flehmen behaviour is characterized by:
* Flehmen behaviour is characterized by:
** Head elevation
** Head elevation