Maxillary sinus

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noun, plural: maxillary sinuses

A large, pyramidal in shape, air-filled paranasal sinus within the body of the maxilla, communicating with the middle meatus of the nose on the same side.


It is the largest of the paranasal sinuses (other sinuses are frontal sinus, ethmoid sinus, and sphenoid sinus).

It is located just below the eyes, in the maxillary bones. It consists of three recesses:

  • an alveolar recess pointed inferiorly, bounded by the alveolar process of the maxilla
  • zygomatic recess pointed laterally, bounded by the zygomatic bone
  • infraorbital recess pointed superiorly, bounded by the inferior orbital surface of the maxilla