Title: A manual of otology
Year: 1900 (1900s)
Authors: Bacon, Gorham, 1855-
Publisher: New York and Philadelphia, Lea brothers & co.
Contributing Library: Yale University, Cushing/Whitney Medical Library
Digitizing Sponsor: Open Knowledge Commons and Yale University, Cushing/Whitney Medical Library
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Text Appearing Before Image:
The external meatus (or external auditory canal).h. The middle ear (or tympanum) (or tympaniccavity), with 1. The membrana tympani and 2. The ossicles. 3. The Eustachian tube and 4. The mastoid process. II. The sound-perceiving apparatus (or internal ear) comprises 1. The vestibule, 2. The semicircular canals, and 3. The cochlea. The latter receives the peripheral expansions of theauditory nerve, the excitation of Avhich produces in thebrain-centre sensations which we call sound. (a) THE EXTERNAL EAR. The external ear consists of 1. The auricle (or pinna) and 2. The external meatus (or external auditory canal). ANATOMY AND PHYSIOLOGY OF THE EAR. 31 1. The Auricle. The auricle, or pinna, pyriforni in shape, is attacliedto the side of the head ])y means of ligaments andmuscles. It usually forms an acute angle with thelateral portion of the head, although the angle variesin different individuals. The auricle is composed ofyellow or reticulated cartilage, except the lower portion, Fig. 1.
Text Appearing After Image:
Auricle. (Politzer.) A. Helix. B. Antihelix. C. Tragus. D. Antitragus. E. Lobule. F. Concha. G. Orifice of the external meatus. cidled the lobule, which is formed mostly of connectivetissue, in the meshes of wliich are globules of fat. Thelobule contains but few bloodvessels and nerves. Thecartilage of the auricle, about y^^ inch in thickness, iscovered by the pericliondrium, and outside of the peri-chondrium is the integument. The latter is morefirmly attached to the anterior than to the posterior 32 MANUAL OF OTOLOGY. surface of the cartilage. The anterior or concave por-tion of the auricle presents a number of ridges and de-pressions. The helix (see Fig. 1, A) begins just above the ex-ternal meatus at a point in the concha called the cristahelicis, and extends upward, backward, and downward,and terminates just above the upper portion of thelobule. The antihelix (B) is another elevation running in aparallel direction with the posterior portion of the helix.It starts by means of two
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Tagged: , bookid:manualotol00baco , bookyear:1900 , bookdecade:1900 , bookcentury:1900 , bookauthor:Bacon__Gorham__1855_ , booksubject:Ear , bookpublisher:New_York_and_Philadelphia__Lea_brothers___co_ , bookcontributor:Yale_University__Cushing_Whitney_Medical_Library , booksponsor:Open_Knowledge_Commons_and_Yale_University__Cushing_Whitney_Medical_Library , bookleafnumber:26 , bookcollection:medicalheritagelibrary , bookcollection:cushingwhitneymedicallibrary , bookcollection:americanaSome local news is curated - Original might have been posted at a different date/ time! Click the source link for details.