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Sulcus
2. Any long, narrow groove or slight depression.
3. In dentistry, a sulcus can be a depression or groove on the surface of a tooth or in the mouth.
Compare a sulcus to a fissure, which is a deep space, groove, or slit on the surface of an organ. Sometimes the two words are used to refer to the same thing in the study of the structure of the human body.
Sulcus is Latin for "ditch or furrow." A furrow is a deep wrinkle.
1. One of the shallow (not deep) grooves, wrinkles, or depressions on the surface of an organ, such as the brain. 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).
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