Maxillary ostium

The maxillary ostium or maxillary hiatus is an opening that forms the drainage channel of the maxillary sinus and is also one of the components of the ostiomeatal unit. It is located posteriorly and medially near the roof of the maxillary sinus measuring approximately 2-4 mm. It drains into the posterior aspect of the hiatus semilunaris into the middle meatus of the nasal cavity.

Anatomy: Head and neck

Anatomy: Head and neck

Article information

rID: 57127
System: Head & Neck
Section: Anatomy
Synonyms or Alternate Spellings:
  • maxillary hiatus
  • ostium maxillare
  • maxillary sinus ostium

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Cases and figures

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