What is semilunar hiatus?

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.

What is the maxillary hiatus?

The maxillary ostium or maxillary hiatus is an opening that forms the drainage channel of the maxillary sinus and is also one of the components of the ostiomeatal unit. It is located posteriorly and medially near the roof of the maxillary sinus measuring approximately 2-4 mm.

What drains to semilunar hiatus?

Notice the semilunar hiatus in the middle meatus and the ethmoid bulla above it. The anterior ethmoidal air cells drain into the hiatus. The hiatus is also connected to the frontal sinus by the frontonasal duct. The middle ethmoid air cells drain into the ethmoidal bulla.

How maxillary hiatus is closed?

In the fresh state, usually only one small opening exists, near the upper part of the cavity; the other is closed by mucous membrane.

Which is the correct definition of hiatus semilunaris?

a deep, narrow groove in the lateral wall of the middle meatus of the nasal cavity, into which the maxillary sinus, the frontonasal duct, and the middle ethmoid cells open. hiatus semilunaris. The groove in the external wall of the middle meatus of the nasal fossa into which the frontal sinus, maxillary sinus, and anterior ethmoid sinuses drain.

Which is the correct definition of hiatus maxillaris?

max·il·lar·y hi·a·tus. the large opening into the maxillary sinus on the nasal surface of the maxilla. hiatus maxillaris. The opening of the maxillary sinus into the nasal cavity, located on the nasal surface of the maxillary bone.

Where do you find the word semilunaris in a dictionary?

Also found in: Dictionary, Thesaurus, Financial, Encyclopedia, Wikipedia. a deep, narrow groove in the lateral wall of the middle meatus of the nasal cavity, into which the maxillary sinus, the frontonasal duct, and the middle ethmoid cells open.

Where does the semilunar hiatus drain the frontal sinus?

Following the curve anteriorly leads into the infundibulum of the frontonasal duct, which drains the frontal sinus . The anterior ethmoidal cells of the ethmoidal sinus open into the front part of the infundibulum as well. In slightly over 50% of subjects, this is directly continuous with the frontonasal duct from the frontal air sinus.