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Semilunar hiatus Lateral wall of nasal cavity; the three nasal conchæ have been removed. (Third caption from the top.) Latin hiatus semilunaris Gray's subject #223 995 The hiatus semilunaris is a halfmoon-shaped groove in the lateral wall of the nasal cavity. 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. Following the curve anteriorly leads into the infundibulum of the frontonasal duct, which drains the frontal sinus. The anterior ethmoidal cells open into the front part of the infundibulum; in slightly over 50% of subjects, this is directly continuous with the frontonasal duct from the frontal air sinus. When the anterior end of the uncinate process fuses with the front part of the bulla, however, this continuity is interrupted and the frontonasal duct then drains directly into the anterior end of the middle meatus. External links SUNY Figs 33:04-05 This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained within it may be outdated. This respiratory system article is a stub. You can help Wikipedia by expanding it. v • d • e v • d • e Head and neck, upper RT: Nose (TA A06.1, GA 10.992) External nose Ala of nose nasal cartilages (of the septum, Greater alar, Lesser alar, Lateral nasal, Accessory nasal, Vomeronasal) Nasal cavity Openings Nasal vestibule · Nostril · Posterior nasal apertures Lateral wall Nasal concha/meati: Superior nasal concha · Middle nasal concha · Inferior nasal concha · Superior nasal meatus · Middle nasal meatus · Inferior nasal meatus Sphenoethmoidal recess · Ethmoid bulla · Agger nasi · Ethmoidal infundibulum · Semilunar hiatus · Maxillary hiatus Medial wall Nasal septum · Vomeronasal organ Mucous membrane Olfactory mucosa Paranasal sinuses Maxillary sinus · Sphenoidal sinuses · Frontal sinus · Ethmoid sinus Naso-pharynx Pharyngeal opening of auditory tube (Salpingopharyngeal fold, Salpingopalatine fold, Torus tubarius) · Pharyngeal tonsil · Pharyngeal recess M: RES anat(n, x, l, c)/phys/devp noco(c)/cong/tumr, sysi/epon, injr proc, drug(R1/2/3/5/6/7)