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1. The sinus is pyramidal in shape - base @ lateral wall of nose; apex @ zygoma; roof @ orbital floor; floor @ alveolar part of maxilla; anterior + posterior walls correspond to the respective maxillary walls.

2. The constant infraorbital ridge (produced by the passage of the infraorbital nerve) appears b/w the anterior wall + roof.

3. The osteum of the sinus opens at the posterior end of the semilunar hiatus in the middle meatus.

4. Blood supply from the facial, maxillary, infraorbital, greater palatine arteries.

5. Nerve supply by branches of the maxillary division of the trigeminal nerve.

6. A large maxillary sinus may extend into the alveolar process so that the roots of the molars may project into the sinus. The apex of the root may also be in contact with the mucous membrane of the sinus. Tooth extraction in this case will lead to a sinus, which eventually closes as it heals.


1. Mcminn. (2003). Last's Anatomy. Elsevier Australia. ISBN:0729537528. Read it at Google Books - Find it at Amazon
2. Netter, F. H. (2019). Atlas of human anatomy. Philadelphia, PA: Elsevier.
3. Image: no reference available.

Ⓒ A. Manickam 2018

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