A sinus ostium (plural: sinus ostia) 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.
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Head and neck, upper RT: Nose (TA A06.1, TH H3.05.01, GA 10.992)
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| External nose |
Ala of nose
nasal cartilages (of the septum, Greater alar, Lesser alar, Lateral nasal, Accessory nasal, Vomeronasal)
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| Nasal cavity |
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Openings
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Nasal vestibule · Nostril · Posterior nasal apertures
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Lateral wall
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Nasal concha/meati: Superior nasal concha · Middle nasal concha · Inferior nasal concha · Superior nasal meatus · Middle nasal meatus · Inferior nasal meatus
Sphenoethmoidal recess · Ethmoid bulla · Agger nasi · Ethmoidal infundibulum · Semilunar hiatus · Maxillary hiatus
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Medial wall
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Nasal septum · Vomeronasal organ
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Mucous membrane
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Olfactory mucosa
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| Paranasal sinuses |
Maxillary sinus · Sphenoidal sinuses · Frontal sinus · Ethmoid sinus
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| Naso-pharynx |
Pharyngeal opening of auditory tube (Salpingopharyngeal fold, Salpingopalatine fold, Torus tubarius) · Pharyngeal tonsil · Pharyngeal recess
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M: RES
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anat(n, x, l, c)/phys/devp
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noco(c, p)/cong/tumr, sysi/epon, injr
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proc, drug(R1/2/3/5/6/7)
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