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Maxillary sinus

The maxillary sinus is the largest paranasal sinus situated in the body of the maxilla. The maxillary sinus is connected with the middle nasal meatus via the maxillary ostium.

The maxillary sinus is bordered by three main walls:

  • The roof – is a thin bony plate shared with the inferior wall of the orbit
  • The floor – is composed by the alveolar process of the maxilla. It hosts a couple of elevations formed by the roots of the maxillary teeth. This can be a potential pathway for infection of the sinus, mainly during a complicated dentist procedure.
  • The base – makes the inferior portion of the lateral wall of the nasal cavity

The maxillary sinus is vascularized mainly by the branches of maxillary artery and innervated by the branches of the maxillary nerve.

Terminology English: Maxillary sinus
English synonyms:
 Sinus paranasalis maxillaris, Sinus Highmori
Latin
: Sinus maxillaris
Latin synonyms:
 Antrum of Highmore, Maxillary paranasal sinus
Definition The maxillary sinus is a paired paranasal sinus situated in the body of the maxilla. 
Main parts Base, roof, floor

Learn more about the sinuses of the skull with the following study unit: 

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