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I do not know of any other field of surgical work which involves such a thorough knowledge of the parts involved as mastoid diseases and its resulting complications. I would say that I have here a number of specimens selected from a lot of work which I did during last winter; I operated on thirty-five cadavers, made seventy operations on both sides of each cadaver in this line of work, to determine some of the points in regard to the anatomy, especially the position of the facial nerve with relation to the submedial triangle, and to demonstrate the best method of entering the temporal bone and the cerebellum and the sigmoid portion of the sinus.
From experimental work which I did, following very closely in the line of Macewen and Kerner, I determined the points which are practically laid down by Macewen in regard to the opening of the mastoid
BEVAN AD. MASTOID DISEASES.. JAMA. 1896;XXVI(15):716–718. doi:10.1001/jama.1896.02430670018002b