The choana is the posterior nasal aperture, essentially the opening at the back of the nasal cavity that connects it to the nasopharynx. It marks the transition from the nasal cavity to the throat.
Here's a more detailed breakdown:
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Definition: The choanae (plural) are the two openings located at the back of the nasal cavity.
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Anatomical Features:
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They are separated by the vomer, a bone that forms part of the nasal septum.
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The choanal space is bounded by specific bones:
- Anteriorly and Inferiorly: Horizontal plate of the palatine bone.
- Superiorly and Posteriorly: Sphenoid bone.
- Laterally: Medial pterygoid plates.
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Function: The choanae allow air to pass from the nasal cavity into the nasopharynx during breathing. They are a crucial part of the respiratory system.
In summary, the choana is the posterior opening of the nasal cavity, allowing airflow into the nasopharynx and playing a vital role in respiration.
