maxillary sinus
Natural Maxillary Sinus Ostium As Seen From Inside...
The natural ostium of the maxillary sinus is hidden behind the posterior and inferior portion of the uncinate process and cannot normally be seen during a routine diagnostic endoscopic examination. The...
Accessory Maxillary Sinus Ostium with the Recirculating...
Mucus may circulate back into a maxillary sinus via an accessory ostium as seen here. Note the thick white stream of mucus flowing down from the hiatus semilunaris and reentering this right maxillary...
![Accessory Maxillary Sinus Ostium [CT scan]](https://medtube.net/images/min/68a3c676d8dbb112cff8f250e98e1741/149/112/1 "Accessory Maxillary Sinus Ostium [CT scan]")
Accessory Maxillary Sinus Ostium [CT scan]
The direct connection between the left maxillary sinus and the left middle meatus seen on this coronal CT scan is an accessory maxillary sinus ostium through the posterior fontanelle.
![Accessory Maxillary Sinus Ostium [large]](https://medtube.net/images/min/bdf143c599d427f707c63a5490b893f8/149/112/1 "Accessory Maxillary Sinus Ostium [large]")
Accessory Maxillary Sinus Ostium [large]
A large accessory maxillary sinus ostium is present through the posterior fontanelle of this left side. Note the prominent nasal septal spur protruding into the middle meatus and abutting against the...
Coronal Anatomy of the Nose and Paranasal Sinuses:...
In this next slice one can now see the anterior ends of the middle turbinate and the anterior portion of the maxillary sinuses. Courtesy of the visible human project.
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