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...
Single female ivory anatomical manikin of seventeenth or eighteenth century European origin. Plate has been removed to reveal the contents of her thorax and abdomen.
Portrait of Thomas Martyn, B. D., F.R.S., Regius Professor of Botany in the University of Cambridge, with a view of King's College Chapel, the Public Library, and Senate House below. Drawn by Russell R. A. Portrait Painter to their Majesties....