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** Curling of the upper [[Lips_-_Anatomy_%26_Physiology|lip]].
 
** Curling of the upper [[Lips_-_Anatomy_%26_Physiology|lip]].
 
* Curling of the upper [[Lips_-_Anatomy_%26_Physiology|lip]] closes the '''nostrils''' and allows negative pressure to form in the '''nasopalatine duct'''.
 
* Curling of the upper [[Lips_-_Anatomy_%26_Physiology|lip]] closes the '''nostrils''' and allows negative pressure to form in the '''nasopalatine duct'''.
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* Vomeronasal organ is an '''accessory olfactory''' organ.
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* Connected to two small openings in the anterior roof of the mouth just behind the upper [[Lips_-_Anatomy_%26_Physiology|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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* Flehmen behaviour allows less volatile pheramones to be examined by sensory neurons in the '''vomeronasal organ'''.
 
* Flehmen behaviour allows less volatile pheramones to be examined by sensory neurons in the '''vomeronasal organ'''.
 
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