What is hiatus semilunaris?
The hiatus semilunaris is a semicircular shaped opening located on the lateral wall of the nasal cavity. It is a component of the ostiomeatal complex and serves as the opening for the frontal and maxillary sinuses and the anterior ethmoid air cells.
Which sinus drains into the hiatus semilunaris?
The frontal sinus drains through the frontonasal duct or through the anterior ethmoidal cells into the hiatus semilunaris.
Does frontal sinus drain into hiatus semilunaris?
sinus opens into the osteomeatal complex. Osteomeatal complex is the term used for a group of anatomical structures that contribute to the final common drainage pathway of Maxillary, Anterior Ethmoidal and Frontal sinuse . Frontal sinus open into the hiatus semilunaris in the middle meatus .
What is ethmoid sinus surgery?
An ethmoidectomy removes infected tissue and bone in the ethmoid sinuses that blocks natural drainage. The surgeon views your ethmoid sinuses with an endoscope, a thin flexible tube with a very small camera and light at the end of it.
How maxillary hiatus is reduced?
The opening of the maxillary hiatus is reduced by the apposition of the descending part of the lacrimal concha and the maxillary process of the inferior nasal concha below and the perpendicular plate of palatine behind.
Where do maxillary sinuses drain?
The maxillary sinus drains into the middle meatus, with the ostium of the sinus opening into the nose on the superior aspect of the medial wall of the sinus, which may explain the high incidence of maxillary sinusitis.
What is an ethmoid bulla?
The ethmoid bulla is the largest anterior ethmoid air cell. It is also one of the most consistent air cells in the middle meatus and is therefore a reliable anatomic landmark (Fig. 2.13). It often lacks a posterior wall, which is why it is not called a cell but rather a bony lamella with a large airspace behind it.
Is bone removed during sinus surgery?
Major complications from sinus surgery are exceedingly rare. However, sinus surgery involves the removal of bone and/or tissues that are located very close to brain and in-between the eyes.
Which bone reduces the size of maxillary hiatus?
In the articulated skull this aperture is much reduced in size by the following bones: the uncinate process of the ethmoid above, the ethmoidal process of the inferior nasal concha below, the vertical part of the palatine behind, and a small part of the lacrimal above and in front; the sinus communicates with the …
What are the walls of the maxillary sinus?
There are six maxillary sinus walls: the superior, anterior, lateral and medial walls are broad, with narrow posterior and inferior walls. Superior: the thin superior wall (forming most of the orbital floor), separates the contents of the orbit from the maxillary sinus.