Changes

==Function==

==Function==

[[Image:Olfactory Epithelium.jpg|thumb|right|150px|Olfactory Epithelium - Copyright David Bainbridge]]

[[Image:Olfactory Epithelium.jpg|thumb|right|250px|Olfactory Epithelium - Copyright David Bainbridge]]

*Olfactory sensory neurones are present in the olfactory epithelium.

The '''olfactory sensory neurones''' are present in the olfactory epithelium. Those animals with a better sense of smell have more highly innervated olfactory epithelium. It is the mucous membrane of the dorsal nasal conchae that is sensitive to smell. Here, odourants dissolve in the mucous membrane, and it is these odourants that are recognised by the olfactory sensory receptors. '''Sensory cilia''', that are present on the surface of the olfactory receptors, project into the film of mucous. The mucous also contains antibodies, to prevent infection. This is because the olfactory neurones provide a direct passage, via the olfactory nerve ([[Cranial Nerves - Anatomy & Physiology|CN I]]), to the brain.

*Those animals with a better sense of smell have more highly innervated olfactory epithelium.

*It is the mucous membrane of the dorsal nasal conchae that is sensitive to smell. Here, odourants dissolve in the mucous membrane, and it is these odourants that are recognised by the olfactory sensory receptors. Sensory cilia, that are present on the surface of the olfactory receptors, project into the film of mucous.

*The mucous also contains antibodies, to prevent infection. This is because the olfactory neurones provide a direct passage, via the olfactory nerve ([[Cranial Nerves - Anatomy & Physiology|CN I]]), to the brain.

==Vasculature==

==Vasculature==