The ostiomeatal complex (or unit) is a common channel that links the frontal sinus, anterior and middle ethmoid sinuses and the maxillary sinus to the middle meatus that allows air flow and mucocililary drainage.
Gross anatomy
The ostiometal complex is composed of five structures:
· infundibilum - common channel that drains the ostia of the maxillary and ethmoid sinuses to the hiatus semilunaris
· ethmoidal bulla - usually a single air cell that projects inferomedially over the hiatus semilunaris
· uncinate process - hook-like process that arises from the posteromedial aspect of the nasolacrimal duct and forms the anterior boundary of the hiatus semilunaris
· hiatus semilunaris - final drainage passage; a region between the ethmoid bulla superiorly and free-edge of the uncinate process
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