Deafness practically illustrated / [James Yearsley].

  • James Yearsley
Date:
[1849]
Catalogue details

Licence: Public Domain Mark

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

    29/200 page 17
    that arising from the relative situation of the parts affected. Ist. Diseases of the external ear—The auricle, ex- ternal auditory passage, and external surface of the membrana tympani. 2nd. Diseases of the middle ear—The cavity of the tympanum, the internal surface of its mem- brane, the small bones of the ear with their muscles; and occlusion, stricture, or complete obliteration of the Eustachian tubes. 3rd. Diseases of the internal ear—The auditory nerve, and contents of the labyrinth. I. DEAFNESS ARISING FROM AFFECTIONS OF THE EXTERNAL EAR. Impaired hearing, from diseases which attack the auricle, as simple erysipelatous inflammation, abscess, or, more rarely, scirrhus, is comparatively infrequent. The affections seldom occasion entire or permanent deafness, and require to be treated more with reference to their constitutional origin and effects, than to their influence upon the function of hearing alone. Diseases of the auricle are observed much more fre- quently in childhood than mature age. At this period of our existence, the supply of fluids to the organ is abun- dant. We may judge of this by the copious secretion of thin transparent yellow wax in the meatus, which sometimes may be seen almost to trickle over the concha. As we advance in life, the ear is more scantily supplied ; and thus it is, that diseases of the auricle and auditory passage appertain more especially to youth; whilst diseases of the tympanum and laby- rinth are the attendants on manhood and old age. Scirrhous degeneration of the auricle is a disease of
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