Trephine or Trepan was a surgical instrument used to open the cranium. It was essentially a device to drill a circular hole in the head. The example pictured here had perpendicular teeth, a center pin and a screw button in the shaft of the barrel to...
Portrait of Morgagni at age 36, in right profile, with a picture of him and a woman walking with a cherub below. Text in Latin. Drawn by R. Blokhuysen.