Deafness practically illustrated : being an exposition of the nature, causes and treatment of diseases of the ear / by James Yearsley.

  • Yearsley, James, 1805-1869.
Date:
1863
Catalogue details

Licence: Public Domain Mark

Credit: Deafness practically illustrated : being an exposition of the nature, causes and treatment of diseases of the ear / by James Yearsley. Source: Wellcome Collection.

Provider: This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.

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    CHAPTER I. BRIEF SKETCH OF THE ANATOMY OF THE EAR. Without a general idea of the structure and func- tions of the various parts of the organ destined for the conveyance of sound to the brain, it would be impos- sible to understand by what means it becomes impaired, or morbidly affected. A sketch of its anatomy and physiology appears, then, to be an indispensable pre- liminary to any description of the disorganization, or diseases, to which it is liable. But it would be digres- sing too far to enter upon an investigation of the phi- losophy of sound, or the nature of those impressions which, through the medium of the nerves, are made by it on the brain; my observations, therefore, must be limited to the structure of the ear,—to the considera- tion of the apparatus by which the intensity of vibra- tions is augmented and carried forward to the seat of the sense; and lastly, to the manner in which the nerve is expanded to receive so delicate an impression. The most natural division of the ear is into three portions; as well from the relative position, as from the peculiar function which appertains to each. It may, then, be divided into— lstly. The external ear, which includes the auricle and the external auditory passage.