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).

2024年3月13日 · The choanae are rigid openings that are completely surrounded by bone. They serve as an outflow from the nasopharynx into the mouth and throat. Inferiorly, the choanae are bound by the posterior edge of the horizontal plate of the palatine bone. On the lateral aspect, they are bordered by the posterior margin of the medial pterygoid process.

2018年1月25日 · A choana (plural: choanae) is one of the two apertures at the back of the nasal cavity that opens into the nasopharynx, the open space behind the nasal cavity in the airways [1]. It is also known as the posterior nasal aperture, and the internal or …

2025年1月17日 · Choana, also known as the posterior nasal aperture, is a small opening located at the back of the nasal cavity. It serves as a passageway for air to travel between the nasal cavity and the pharynx, which is the cavity located behind the nasal cavity and above the larynx.

The Choana e are the posterior nasal aperture, separated by the vomer. It is the opening between the nasal cavity and the nasopharynx. It is therefore not a structure but a space bounded as follows: laterally by the medial pterygoid plates.

2023年5月1日 · The choanae are located at the posterior segment of the nasal cavity and open into the nasopharynx. The nasal cavity assists in respiration, olfaction, conditioning of inspired air, and immune defense.

The meaning of CHOANA is either of the pair of posterior apertures of the nasal cavity that open into the nasopharynx —called also posterior naris.