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Nasal meatus
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In , the term nasal meatus

(2025). 9780128118375, Elsevier.
can refer to any of the three (passages) through the : the superior meatus ( meatus nasi superior), middle meatus ( meatus nasi medius), and inferior meatus ( meatus nasi inferior).

The nasal meatuses are the spaces beneath each of the corresponding . In the case where a fourth, supreme nasal concha is present, there is a fourth supreme nasal meatus.


Structure
The superior meatus is the smallest of the three. It is a narrow cavity located obliquely below the . This meatus is short, lies above and extends from the middle part of the below. From behind, the sphenopalatine foramen opens into the cavity of the superior meatus and the meatus communicates with the posterior . Above and at the back of the is the sphenoethmoidal recess which the opens into. The superior meatus occupies the middle third of the lateral wall.

The middle meatus is the middle-sized and located nasal opening, lying underneath the middle concha and above the where the meatus extends along its length. On it is a curved fissure, the hiatus semilunaris, limited below by the edge of the uncinate process of the ethmoid and above by an elevation named the bulla ethmoidalis; the middle are contained within this bulla and open on or near to it.

Through the hiatus semilunaris the meatus communicates with a curved passage termed the infundibulum, which communicates in front with the anterior ethmoidal cells and in rather more than fifty percent of skulls is continued upward as the frontonasal duct into the frontal air-sinus; when this continuity fails, the frontonasal duct opens directly into the anterior part of the meatus.

Below the bulla ethmoidalis and hidden by the uncinate process of the ethmoid is the opening of the (ostium maxillare); an accessory opening is frequently present above the posterior part of the inferior nasal concha.

The inferior meatus is the largest of the three. It lies below the inferior concha and above the nasal cavity. It extends most of the length of the nasal cavity’s lateral wall. It is broader in the front than at the back, and presents anteriorly the lower orifice of the nasolacrimal canal.


External links
  •  — Coronal section

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