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The semilunar hiatus (eg, hiatus semilunaris) is a crescent-shaped/semicircular/ (2025). 9781496347213, Lippincott Williams & Wilkins. ISBN 9781496347213 curved slit /groove upon the lateral wall of the nasal cavity at the middle nasal meatus just inferior to the Ethmoid 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 Ethmoid bulla, and posteriorly by the ethmoidal process of the inferior nasal concha. It leads into the ethmoidal infundibulum; it marks the medial limit of the ethmoidal infundibulum.
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