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The nasal wall of the maxillary sinus, or base, presents, in the disarticulated bone, a large, irregular aperture that communicates with the nasal cavity. [citation needed] In the articulated skull this aperture is much reduced in size by the following bones:
the terminal third of the maxillary artery; the maxillary nerve (CN V 2, the second division of the trigeminal nerve), with which is the nerve of the pterygoid canal, a combination of the greater petrosal nerve (preganglionic parasympathetic) and the deep petrosal nerve (postganglionic sympathetic). To obtain block anesthesia of the entire ...
It then turns [1]: 616 to pass inferomedially [1]: 653–654 and anteriorly [1]: 699 while passing through the anterior wall of the maxillary sinus [1]: 616 (the canal is marked by a groove upon the internal surface of the anterior wall of the sinus [1]: 699 ).
The lateral wall of each nasal cavity mainly consists of the maxilla. However, there is a deficiency that is compensated for by the perpendicular plate of the palatine bone, the medial pterygoid plate, the labyrinth of ethmoid and the inferior concha. The paranasal sinuses are connected to the nasal cavity through small orifices called ostia.
Recent studies have classified two types of maxillary sinus septa: primary and secondary. Primary septa are those initially described by Underwood and that form as a result of the floor of the sinus sinking along with the roots of erupting teeth; these primary septa are thus generally found in the sinus corresponding to the space between teeth, as explained by Underwood.
Its medial surface forms part of the lateral wall of the nasal cavity; at its upper part is a rough, uneven area, which articulates with the ethmoid, closing in the anterior ethmoidal cells; below this is an oblique ridge, the ethmoidal crest, the posterior end of which articulates with the middle nasal concha, while the anterior part is termed ...
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 semilunar hiatus (eg, hiatus semilunaris) is a crescent-shaped [citation needed] /semicircular/ [1] curved [2] slit [2] /groove [1] upon the lateral wall of the nasal cavity [3] at the middle nasal meatus just inferior to the ethmoidal bulla. [2] It is the location of the openings for the frontal sinus, maxillary sinus, and anterior ...