FACTOID #53: If you thought Antarctica was inhospitable, think again - its land area is only ninety-eight percent ice. Reassuringly, the other 2% is categorised as "barren rock".
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Sulci (the plural form of sulcus) helps form the boundaries of several irregular ridges on the brain known as convolutions, and rounded elevations on the brain known as gyri (plural of gyrus).
Compare a sulcus to a fissure, which is a deep space, groove, or slit on the surface of an organ.
Sulcus is Latin for "ditch or furrow." A furrow is a deep wrinkle.
On the medial surface, it is separated from the cingulate gyrus by the cingulate sulcus; and on the inferior surface, it is bounded behind by the stem of the lateral fissure.
The anterior central gyrus (gyrus centralis anterior; ascending frontal convolution; precentral gyre) is bounded in front by the precentral sulcus, behind by the central sulcus; it extends from the supero-medial border of the hemisphere to the posterior ramus of the lateral fissure.
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.
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