A treatise on the physiology and diseases of the ear ; containing a comparative view of its structure and functions, and of its various diseases, arranged according to the anatomy of the organ, or as they affect the external, the intermediate and the internal ear / By John Harrison Curtis.

  • Curtis, John Harrison, 1778-approximately 1860.
Date:
1817
Catalogue details

Licence: Public Domain Mark

Credit: A treatise on the physiology and diseases of the ear ; containing a comparative view of its structure and functions, and of its various diseases, arranged according to the anatomy of the organ, or as they affect the external, the intermediate and the internal ear / By John Harrison Curtis. Source: Wellcome Collection.

    77/134 (page 47)
    II. Obstruction of the Eustachian Tube, requir- ing perforation of the Tympanum. From its puriform discharge, the next affec- tion of the tympanum I have to consider, is, the influence produced on it by the obstruction of the Eustachian tube. By this obstruction a very great degree of , deafness is produced, and air can no longer be admitted into the cavity of the tympanum, while the included portion of air is either ab- sorbed or else it remains. If it remain, it becomes condensed, and coun- terbalances the pulses of air excited by sound- ing bodies; if it be absorbed, the membrane of the tympanum is carried by the pressure of the atmosphere as far as its limits can go, and in this case cannot vibrate, as it ought, to any consider- able degree. That this last opinion is the most just, is confirmed by dissection, which has