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==Nose==

==Nose==

The nares are supported by nasal cartilages. Unlike other species the ventral and dorsal lateral nasal cartilages, which attach to the rostral end of the nasal septum, do not contact each other. In the hose, the dorsal and ventral cartilages are indistinct or absent. Instead, horses have '''alar cartilages''' to support the nostrils, but the lateral walls of the nostrils remain unsupported; allowing greater mobility. The alar cartilages divide the nostril into the dorsal ('false nostril') and ventral ('true nostril').  The dorsal nostril leads to a blind-ending diverticulum in the nasoincisive notch. The ventral nostril leads to the nasal cavity. This is important when placing a nasogastric tube, which must be inserted ventrally.  

The nares are supported by '''nasal cartilages'''. Unlike other species the ventral and dorsal lateral nasal cartilages, which attach to the rostral end of the nasal septum, do not contact each other. In the hose, the dorsal and ventral cartilages are indistinct or absent. Instead, horses have '''alar cartilages''' to support the nostrils, but the lateral walls of the nostrils remain unsupported; allowing greater mobility. The alar cartilages divide the nostril into the dorsal ('false nostril') and ventral ('true nostril').  The dorsal nostril leads to a blind-ending diverticulum in the nasoincisive notch. The ventral nostril leads to the nasal cavity. This is important when placing a nasogastric tube, which must be inserted ventrally.  

Another species difference is that the nasolacrimal duct opens at the nasal puncta on the ventral floor of the nasal vestibule close to the transition point between the nasal mucosa and the nostril.  

Another species difference is that the nasolacrimal duct opens at the nasal puncta on the ventral floor of the nasal vestibule close to the transition point between the nasal mucosa and the nostril.

 

==Nasal Cavity==

==Nasal Cavity==

The nasal cavity is the area between the nostrils and the cribiform plate, it is divided by a septum into right and left sides. The '''nasal conchae''' (ethmoid turbinates) are scroll-shaped bones covered with nasal mucosa that project into the nasal cavity. The first endoturbinate is the base of the dorsal nasal conchae. It extends the furthest into the nasal cavity. The second endoturbinate forms the middle nasal concha. Subsequent turbinates are much smaller. The ventral nasal conchus is not formed by turbinates, but by the maxilla.

The nasal cavity is the area between the nostrils and the cribiform plate, it is divided by a septum into right and left sides. The '''nasal conchae''' (ethmoid turbinates) are scroll-shaped bones covered with nasal mucosa that project into the nasal cavity. The first endoturbinate is the base of the dorsal nasal conchae. It extends the furthest into the nasal cavity. The second endoturbinate forms the middle nasal concha. Subsequent turbinates are much smaller. The ventral nasal conchus is not formed by turbinates, but by the maxilla.