Deafness practically illustrated / [James Yearsley].

  • James Yearsley
Date:
[1849]
Catalogue details

Licence: Public Domain Mark

Credit: Deafness practically illustrated / [James Yearsley]. Source: Wellcome Collection.

    120/200 page 108
    panum, which had taken on inflammatory symptoms, and ended in suppuration, the matter discharging itself through the ruptured membrane of the drum. Another very troublesome complication of ear disease, tinnitus, often occurs as the sequel of irritation in the throat and hypertrophy of these glands. Tinnitus rarely exists without a marked degree of deafness; but it does sometimes happen when the tonsils are not of sufficient magnitude to occasion deafness, though loss of hearing generally follows, when this distressing symptom has once established itself. | Already I have insisted on the paramount impor- tance of a healthy state of the mucous membrane of the ear to perfect hearing. I have advanced the novel view, that by far the greater number of deaf persons have lost their hearing by a diseased condition of this same mucous membrane. ‘This I have substantiated by facts, and have pointed out the better methods of prevention and cure which must result from such an improved knowledge of the pathology of the ear. The modes in which external agencies can affect the lining membrane of the tympanal cavity are, in the first place, through the external passage and the fibrous membrane of the drum, and in the second, through the Eustachian tubes entering to the ear from the throat and posterior nares. Of the two tracks there can be no shadow of doubt that the latter is by far the most frequent. The external meatus enjoys a comparative protection from cold on account of the presence of wax, and the struc- ture of the membrana tympani forms a very efficient protection to the middle ear in this direction. On the other hand, the mucous membrane of the throat, from its extensive sympathies with other parts of the body,
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