Biology:Orbital gyri

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Orbital gyri
Cerebral Gyri - Inferior Surface2.png
Human brain bottom view. Orbital gyri shown in green.
Gray729 orbital gyrus.png
Orbital surface of left frontal lobe. Orbital gyri shown in orange.
Latingyri orbitales
Anatomical terms of neuroanatomy

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 orbital sulcus. These are named, from their position, the medial, anterior, lateral, and posterior, orbital gyri. The medial orbital gyrus presents a well-marked antero-posterior sulcus, the olfactory sulcus, for the olfactory tract; the portion medial to this is named the straight gyrus, and is continuous with the superior frontal gyrus on the medial surface.


Bailey and Bremer reported that stimulation to the central end of the vagus nerve caused electrical activity in the inferior orbital surface (

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