Aids to otology / by W.R.H. Stewart.

  • Stewart, W. R. H. (William Robert Henry), 1852-1906.
Date:
[1893]
Catalogue details

Licence: Public Domain Mark

Credit: Aids to otology / by W.R.H. Stewart. Source: Wellcome Collection.

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    AIDS TO OTOLOGY CHAPTER I. ANATOMY OF THE EAR. Divided into—External, Middle, Internal. The EXTERNAL EAK.—Comprises the pinna or auricle, and the external auditory meatus. The AURICLE.—A trumpet-shaped expansion attached to the side of the head by muscles, skin, etc. It is made up of eleva- tions and depressions arranged so as to collect the sound-waves and conduct them into the external meatus. These elevations and depressions consist of— The Concha.—A depression surrounding the opening of the external auditory meatus. The Tragus.—A prominence in front of the concha, projecting backwards over the external auditory meatus. . The Anti-Tragus.—A prominence more posterior and separated from the former by the notch. The Lobule,—Pendulous portion below the anti-tragus. The Anti-Helix.—^A curved ridge starting from the anti- tragus and surrounding the concha. The Fossa of the Helix.—The depression between the anti- helix and the helix. The Helix.—The thin margin which surrounds the pinna, starting from just above the tragus and losing itself in the lobule.