[2][3] An accessory maxillary hiatus may be present either anterior or posterior to the inferior portion of the uncinate process of ethmoid bone.

[2][3] It opens into the nasal cavity inferior to the bulla ethmoidalis, and is partly obscured by the inferior end of the uncinate process of ethmoid bone.

[4] The bone window of this aperture itself is much larger, but the actual opening is much reduced[3] by the following: the uncinate process of the ethmoid superiorly, the ethmoidal process of inferior nasal concha inferiorly, the perpendicular plate of palatine bone posteriorly, and a small part of the lacrimal bone anteriorly and superiorly,[4] as well as by the adjacent soft tissues.

[3] This article incorporates text in the public domain from page 995 of the 20th edition of Gray's Anatomy (1918)

This human musculoskeletal system article is a stub.