sulcus /sul″kəs/ pl. sulci [L, furrow] , a shallow depression, or furrow on the surface of an organ, such as cerebral sulcus that separates the convolutions of the cerebral hemisphere. A sulcus is usually not as deep as a fissure, but, in the terminology of anatomy, the words sulcus and fissure are often used interchangeably. −sulcate, adj.
