Sulcus (morphology)
: sulci) is a furrow or fissure (Latin fissura, pl.It may be a groove, natural division, deep furrow, elongated cleft, or tear in the surface of a limb or an organ, most notably on the surface of the brain, but also in the lungs, certain muscles (including the heart), as well as in bones, and elsewhere.In invertebrate zoology, a sulcus is a fold, groove, or boundary, especially at the edges of sclerites or between segments.In pollen, a grain that is grooved by a sulcus is termed sulcate.In the brain, a sulcus is a groove formed in the stage of gyrification by the folding of the cortex.