Chinese ivory anatomical manikin which was used by upper class women to indicate to their physician the site of their problem. The top-knot from her hair has been removed to reveal a stopper.
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...