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Objectives: The maxillary line is a mucosal projection along the lateral nasal wall that serves as a landmark for endoscopic sinus and orbital procedures. The anatomic relations of this structure are not well described. We sought to define the anatomy of the maxillary line and explore its clinical utility.

Study Design: Cadaver dissection/case series.

Methods: Twenty‐five cadaveric nasal specimens were dissected. Extranasal and intranasal measurements of structures including the lacrimal crests, sac and duct, the suture line between the maxillary and lacrimal bones, and the maxillary sinus ostium were taken. The mid‐point of the maxillary line, termed the “M point,” was used for reference. The distance from the nasal sill to the M point was measured in 30 consecutive clinic patients.

Results: The maxillary line corresponded intranasally to the junction of the uncinate and maxilla and extranasally to the suture line …