1. (pl. cingula) The cingulum is a curved bundle of nerve fibers in each cerebral hemisphere, which nearly encircles its connection with the corpus callosum. The cingulum is a part of the brain concerned with anger and depression. The surgical removal of the cingulum, a procedure known as cingulectomy, has occasionally been carried out in some cases of intractable mental illness.
2. Alternatively, the cingulum may refer to a small protuberance on the lingual surface of the crowns of incisor and canine teeth.