Transactions of the ... Annual Session of the Medical Society of the State of North Carolina [serial] 36 (1889)
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The latter is a delicate semi-transparent membrane, dividing the external from the middle ear. It can rarely be seen in the white races without instrumental aid, but may usually be seen in ^-Referring to a beautifully executed drawing by the author.— Eds. DEAFNESS. 103 the negro by simple iDspection, owing to its larger size and greater straightness in that race. The membrane is tilted outward from above at an angle of 45°, usually, though, in "musical ears," it is much more vertical. The middl...e ear, or tympanum, which is the part concerning us more particularly at present — since the seat of deafness is most frequently to be found here — is situated within the substance of the temporal bone, and in that part of this bone, which, on account of its extreme density, is called the petrous portion. This little tym- panic cavity measures something less than half an inch from before backward, one-fourth of an inch in the vertical direction and a little less in the transverse. It is guarded from the outside world by the drum-membrane.
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