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Maxillary sinus

The maxillary sinus (Latin: sinus maxillaris) is a paired air-filled cavity located within the body of the maxilla. It is the most significant paranasal sinus and appears pyramidal in shape. Both maxillary sinuses are located lateral to the nasal cavities and under the orbits.

Skull with frontal part removed, paranasal sinuses (maxillary sinus)
Maxillary sinus by

Each maxillary sinus opens into the nasal cavity via the opening located on the nasal surface of the maxilla called the maxillary hiatus. The maxillary sinus drains into the middle nasal meatus of the nasal cavity.


Walls of maxillary sinus

As the maxillary sinus is located within the maxilla, its walls are formed by the anatomical landmarks of the maxilla. The walls of the maxilla are as follows:

  • Medial - nasal surface of the body;
  • Lateral - zygomatic process of the maxilla;
  • Inferior - alveolar process and part of the palatine process of the maxilla;
  • Superior - orbital surface of the body;
  • Anterior - anterior surface of the body;
  • Posterior - infratemporal surface of the body.


Blood supply of maxillary sinus

The arterial blood supply to the maxillary sinus is provided by several arteries, including:

  • Superior anterior, middle and posterior alveolar arteries
  • Infraorbital artery
  • Greater palatine artery


Nerve supply of maxillary sinus

The sensory innervation of the mucosa is provided by the following nerves:

  • Posterior superior alveolar nerve
  • Middle superior alveolar nerve
  • Anterior superior alveolar nerve
  • Infraorbital nerve