What does a “sulcus” refer to in the human body?

A sulcus is the anatomical term for a furrow, fissure, crevice or a groove in the human body. Two examples are the central sulcus of the cerebellum which divides the frontal and parietal lobes, and the radial sulcus along the lateral border of the humerus which houses the radial nerve and the deep brachial artery.