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Choana
Each of two openings from the nasal cavity to the throat / From Wikipedia, the free encyclopedia
The choanae (sg.: choana), posterior nasal apertures or internal nostrils are two openings found at the back of the nasal passage between the nasal cavity and the pharynx, in humans and other mammals (as well as crocodilians and most skinks). They are considered one of the most important synapomorphies of tetrapodomorphs, that allowed the passage from water to land.[1]
Quick Facts Details, Identifiers ...
Choana | |
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![]() Lateral wall of nasal cavity. | |
![]() Dissection of the muscles of the palate from behind. (Choanae visible at center top.) | |
Details | |
Identifiers | |
Latin | choana |
TA98 | A02.1.00.096 |
TA2 | 501 |
FMA | 76585 |
Anatomical terminology |
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In animals with secondary palates, they allow breathing when the mouth is closed.[2] In tetrapods without secondary palates their function relates primarily to olfaction (sense of smell).
The choanae are separated in two by the vomer.