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Before beginning the consideration of this paper, I wish to request your attention for a few moments to some of the anatomic features of the middle ear and mastoid.
It is in an air-containing space, lined throughout with mucous membrane, and continuous with the covering of the naso-pharynx and adjacent parts. Its divisions are the eustachian tubes, the tympanic cavity, and the mastoid cells. The first is the channel of connection between the pharynx and the tympanum and consists of two portions, the cartilaginous and osseous, the widest opening being pharyngeal and its narrowest point at the junction of the soft and the bony part. It is from one inch to one and one-third inches long, the osseous forming about one-third of its length, and the two portions are formed at an obtuse angle. Its direction is obliquely outward, backward and slightly upward. The tubal mucous membrane contains throughout a
MILBURY FS. DISEASES OF THE MASTOID, THEIR COURSE AND TREATMENT.. JAMA. 1898;XXX(18):1022-1026. doi:10.1001/jama.1898.72440700014001d