(Chapter 12) Footnote 77:

This section was rewritten for the 1555 edition is somewhat briefer form: “Foramen [for. stylomastoideum] from the middle of the cavity of the organ of hearing that is cut in the temporal bone, running backward to this region on the outside of the skull next to the region of the mammillary processes [p. mastoideus], and never reaching the inside of the skull. Since on account of its winding and labyrinthine course it does not easily transmit to the ear cavity a bristle or lead wire that is pushed into it, it is called tuflo/n in Greek and caecum (blind) in Latin. It is provided for a small branch of the fifth pair [n. facialis] of cerebral nerves, which, since Nature wished it to harden, she quite cleverly brought it down through a winding foramen of the hardest and dryest bone [os temporale, pars petrosa].” This foramen should not be confused with the foramen cecum that runs between the frontal bone and the crista galli.