Ostiomeatal Complex

**Semantic type:** Body Part, Organ, or Organ Component

**Definition:** A narrow channel that connects the frontal sinus, anterior ethmoid air cells, and maxillary sinus to the middle meatus, allowing drainage and ventilation. It includes the maxillary ostium, infundibulum, ethmoid bulla, uncinate process, and hiatus semilunaris.

**Synonyms:** - OMU - OSTIOMEATAL COMPLEX - Osteomeatal Complex - Ostiomeatal Unit