The infraorbital groove (or sulcus) is located in the middle of the posterior part of the orbital surface of the maxilla.

The infraorbital groove begins at the middle of the posterior border of the maxilla (with which it is continuous).

It passes forward, and ends in a canal which subdivides into two branches.

The infraorbital groove has an average length of 16.7 mm, with a small amount of variation between people.

[1] This article incorporates text in the public domain from page 159 of the 20th edition of Gray's Anatomy (1918)