A commissurotomy is a surgical incision of a commissure in the body, as one made in the heart at the edges of the commissure formed by cardiac valves, or one made in the brain to treat certain psychiatric disorders.

Cordotomy (or chordotomy) is a surgical procedure that disables selected pain-conducting tracts in the spinal cord, in order to achieve loss of pain and temperature perception.

Corneal transplantation, also known as corneal grafting, is a surgical procedure where a damaged or diseased cornea is replaced by donated corneal tissue (the graft).

A corpectomy is a surgical procedure that involves removing all or part of the vertebral body (Latin: corpus vertebrae, hence the name corpectomy), usually as a way to decompress the spinal cord and nerves.

A craniotomy is a surgical operation in which a bone flap is temporarily removed from the skull to access the brain.