sulcus terminalis sulcus terminalis terminal sulcus or sulcus terminalis may refer to: 1. terminal sulcus (heart), a groove in the right atrium of the heart 2. terminal sulcus (tongue), a groove that separates the tongue into a superior oral surface and a posterior pharyngeal surface this article is issued from wikipedia. the text is licensed under creative commons - attribution - sharealike. additional terms may apply for the media files.