semilunar hiatus

{{Infobox anatomy

| Name = Semilunar hiatus

| Latin = hiatus semilunaris

| Image = Gray856.png

| Caption = Lateral wall of nasal cavity; the three nasal conchæ have been removed. (Third caption from the top.)

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| System =

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The semilunar hiatus (eg, hiatus semilunaris) is a crescent-shaped{{Citation needed|date=July 2023}}/semicircular/{{cite book |last1=Moore |first1=Keith L. |title=Essential Clinical Anatomy |last2=Dalley |first2=Arthur F. |last3=Agur |first3=Anne M. R. |publisher=Lippincott Williams & Wilkins |year=2017 |isbn=978-1496347213 |edition=6th |pages=966–967}} curved{{Cite book |last=Sinnatamby |first=Chummy S. |title=Last's Anatomy |publisher= Elsevier Australia|year=2011 |isbn=978-0-7295-3752-0 |edition=12th |pages=374}} slit/groove upon the lateral wall of the nasal cavity{{Cite book |last=Standring |first=Susan |url=https://www.worldcat.org/oclc/1201341621 |title=Gray's Anatomy: The Anatomical Basis of Clinical Practice |year=2020 |isbn=978-0-7020-7707-4 |edition=42th |location=New York |pages=690 |oclc=1201341621}} at the middle nasal meatus just inferior to the ethmoidal bulla. It is the location of the openings for the frontal sinus, maxillary sinus, and anterior ethmoidal sinus. It is bounded inferiorly and anteriorly by the sharp concave margin of the uncinate process of the ethmoid bone, superiorly by the ethmoidal bulla, and posteriorly by the ethmoidal process of the inferior nasal concha.{{Cite web |title=Bony semilunar hiatus - e-Anatomy - IMAIOS |url=https://www.imaios.com/en/e-anatomy/anatomical-structure/bony-semilunar-hiatus-1536896620 |access-date=2023-11-13 |website=www.imaios.com |language=en}} It leads into the ethmoidal infundibulum;{{Cite book |last=Gray |first=Henry |url=https://archive.org/details/anatomyofhumanbo1918gray/page/659/mode/2up?view=theater |title=Gray's Anatomy |year=1918 |edition=20th |pages=995}} it marks the medial limit of the ethmoidal infundibulum.