Search results
Results from the WOW.Com Content Network
The superior meatus occupies the middle third of the nasal cavity’s lateral wall. The middle meatus is the middle-sized and located nasal opening, lying underneath the middle concha and above the inferior concha where the meatus extends along its length.
The middle ethmoidal cells drain directly into the middle nasal meatus. [3] The posterior ethmoidal cells drain directly into the superior nasal meatus [3] [5] at the sphenoethmoidal recess; [5] sometimes, one or more opens into the sphenoidal sinus. [4]
The frontonasal duct may or may not drain into the ethmoidal infundibulum - this is determined by the place of attachment of the uncinate process of the ethmoid bone: if the uncinate process is attached to the lateral nasal wall, the frontonasal duct will open directly into the middle nasal meatus; if otherwise, it will drain into the infundibulum.
The superior attachment of the uncinate process determines the drainage pattern of the frontal sinus. In the first case, the infundibulum and the frontal recess are separated from each other, forcing the frontal sinus to drain directly into the middle meatus and not into the ethmoidal infundibulum.
It drains into the middle meatus of the nose [1] [2] through the semilunar hiatus. ... Furthermore, the drainage orifice lies near the roof of the sinus, and so the ...
The frontonasal duct passes inferior-ward [5] to open either [3] into the middle nasal meatus at the anterior end of [3] the ethmoidal infundibulum, [3] [5] [2] or into the anterior ethmoidal air cells (which then in turn drain into the nasal cavity). [3] The duct is lined by mucous membrane. [citation needed]
A narrow opening called a sinus ostium from each of the paranasal sinuses allows drainage into the nasal cavity. The maxillary sinus is the largest of the sinuses and drains into the middle meatus. Most of the ostia open into the middle meatus and the anterior ethmoid, that together are termed the ostiomeatal complex. [32]
The ethmoid bulla (or ethmoidal bulla) is a rounded elevation upon the lateral wall of the middle nasal meatus [1] [2]: 377 (nasal cavity inferior to the middle nasal concha) produced by one or more of the underlying middle ethmoidal air cells (which open into the nasal cavity upon or superior to the ethmoidal bulla [2]: 374 [3]).