Sulcus terminalis linguae; a V-shaped groove, or furrow, with the apex pointing backward, on the surface of the tongue, marking the separation between the oral, or horizontal, and the pharyngeal, or vertical, parts.

The sulcus terminalis atrii dextri; is a groove on the surface of the right atrium of the heart (thin-walled chamber of the heart which pumps blood into the right ventricle for ejection into the pulmonary circulation), marking the junction of the primitive sinus venosus (cavity at the tail end of the embryonic cardiac tube) with the atrium (a chamber of the heart).