Changes

[[Image:Royalpython.jpg|300px|thumb|right|'''Heat-sensitive receptors in labial pits of a [[Royal Python|royal python]]''' Photo credit: Claire Porteous]]

[[Image:Royalpython.jpg|300px|thumb|right|'''Heat-sensitive receptors in labial pits of a [[Royal Python|royal python]]''' Photo credit: Claire Porteous]]

==Chemoreception==

==Chemoreception==

The chemosensory system in reptiles is mediated by sensory cells in the nasal cavity and by the [[Jacobsons organ|Jacobson's organ]] (vomeronasal organ) that is located in the roof of the mouth, caudal to the rostral scales and within the margins of the upper arcade.  The tongue brings odoriferous particles to [[Jacobsons organ|Jacobson's organ]], which is innervated by the vomeronasal branch of the olfactory nerve.  Receptors may also detect the presence of water.  A chemosensory system analogous to taste exists in reptiles where taste buds and sensory papillae are spread throughout the oral mucosa.  They are innervated primarily by the glossopharyngeal nerve (cranial nerve IX).

The chemosensory system in reptiles is mediated by sensory cells in the nasal cavity and by the Jacobson's organ (vomeronasal organ) that is located in the roof of the mouth, caudal to the rostral scales and within the margins of the upper arcade.  The tongue brings odoriferous particles to the Jacobson's organ, which is innervated by the vomeronasal branch of the olfactory nerve.  Receptors may also detect the presence of water.  A chemosensory system analogous to taste exists in reptiles where taste buds and sensory papillae are spread throughout the oral mucosa.  They are innervated primarily by the glossopharyngeal nerve (cranial nerve IX).

==Heat-sensitive receptors==

==Heat-sensitive receptors==