Orbital sulcus
The inferior or orbital surface of the frontal lobe is concave, and rests on the orbital plate of the frontal bone.It is divided into four orbital gyri by a well-marked H-shaped sulcus the orbital sulcus.This article incorporates text in the public domain from page 822 of the 20th edition of Gray's Anatomy (1918)This neuroanatomy article is a stub.You can help Wikipedia by expanding it.