This skull fragment, found in a London Hospital cemetery, had clearly been used by medical students to practice trephining, or the drilling of holes in the skull to relieve intracranial pressure in cases of skull fracture, and to treat other ailments.

Source: Kate Ravilious: Haunt of the Resurrection Man: A forgotten graveyard, the dawn of modern medicine, and the hard life in 19th-century London

This skull fragment, found in a London Hospital cemetery, had clearly been used by medical students to practice trephining, or the drilling of holes in the skull to relieve intracranial pressure in cases of skull fracture, and to treat other ailments.

Source: Kate Ravilious: Haunt of the Resurrection Man: A forgotten graveyard, the dawn of modern medicine, and the hard life in 19th-century London