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The posterior nasal apertures or internal nostrils are found at the posterior (back part) of the nasal passage between the nasal cavity and the throat in tetrapods with secondary palates, including humans and other mammals (as well as crocodilians and most skinks). In animals with secondary palates, they allow breathing when the mouth is closed.〔Janvier, Philippe (2004) "Wandering nostrils". ''Nature'', 432 (7013): 23–24. 〕 They are also known as the choanae (singular choana) (from Greek χοάνη "funnel"). In tetrapods without secondary palates their function relates primarily to olfaction (sense of smell). The choanae are separated into two parts by the vomer. == Boundaries == It is the opening between the nasal cavity and the nasopharynx. It is therefore not a structure but a space bounded as follows: * anteriorly and inferiorly by the horizontal plate of palatine bone, * superiorly and posteriorly by the sphenoid bone * laterally by the medial pterygoid plates. * medially by the Vomer 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Posterior nasal apertures」の詳細全文を読む スポンサード リンク
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