A sulcus (pl. sulci) is a depression or fissure in the surface of an organ, most especially the brain. In the brain it surrounds the gyri, creating the characteristic appearance of the brain. Wikipedia does not yet have an article with this exact name. ... In the anatomy of animals, the brain, or encephalon, is the supervisory center of the nervous system. ...
The inferior frontal gyrus (gyrus frontalis inferior; subfrontal gyre) lies below the inferior frontal sulcus, and extends forward from the lower part of the precentral sulcus; it is continuous with the lateral and posterior orbital gyri on the under surface of the lobe.
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.
It lies between the cingulate sulcus and the supero-medial margin of the hemisphere.
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