Sinus ostium

Sinus ostium
Details
Latin	Sinus ostium (plural: sinus ostia)
*Anatomical terminology* [edit on Wikidata]

A sinus ostium is the opening that connects a sinus to the nasal cavity itself. It is a tight area that tends to have a higher percentage of cilia than the surrounding mucosa.

If the sinus ostium is blocked this will cause an accumulation of fluid in the sinus.

Anatomy of the human nose

External nose

Nasal cavity

Openings	Nasal vestibule Nostril Posterior nasal apertures

Lateral wall	Nasal conchae: Supreme nasal concha Superior nasal concha Middle nasal concha Inferior nasal concha Nasal meatus: (Supreme superior middle inferior) Sphenoethmoidal recess Ethmoid bulla Agger nasi Ethmoidal infundibulum Semilunar hiatus Maxillary hiatus

Medial wall	Nasal septum Vomeronasal organ

Mucous membrane	Olfactory mucosa

Paranasal sinuses

Naso-pharynx

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