cells • Normal ostiomeatal complex (illustration) - Ganzer Fall bei Radiopaedia
The ostiomeatal complex (OMC) or ostiomeatal unit (OMU), sometimes less correctly spelled as osteomeatal complex, is a common channel that links the frontal sinus, anterior ethmoid air cells and the maxillary sinus to the middle meatus, allowing airflow and mucociliary drainage.
The ostiomeatal complex is composed of five structures:
There is a wide range of anatomical variants that affect the many structures that compose the ostiomeatal complex and are not pathological in themselves but their presence can result in disease. See main article, ostiomeatal narrowing due to nasal anatomical variation, for the complete list.
- Hiatus semilunaris
- maxillary ostium
- Processus uncinatus ossis ethmoidalis
- ethmoidal bulla
- infundibulum (NNH)