A text-book of the diseases of the ear and adjacent organs / by Dr. Adam Politzer ; translated from the third German edition by Oscar Dodd ; edited by Sir William Dalby.

Ádám Politzer

Date:: 1894

Credit: A text-book of the diseases of the ear and adjacent organs / by Dr. Adam Politzer ; translated from the third German edition by Oscar Dodd ; edited by Sir William Dalby. Source: Wellcome Collection.

Provider: This material has been provided by the Harvey Cushing/John Hay Whitney Medical Library at Yale University, through the Medical Heritage Library. The original may be consulted at the Harvey Cushing/John Hay Whitney Medical Library at Yale University.

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$THE ANATOMY AND PHYSIOLOGY OF THE SOUND- CONDUCTING APPAKATUS. I. THE EXTERNAL EAR. A. The Auricle. The auricle presents in its outline a pyriform shape. Its im- position is between two horizontal lines, of which the superior touches the eyebrows, the inferior the tip of the nose. While it surrounds :he exrernal orifice of the ear, it is fastened on the lateral part of the head, midway between the forehead and the occiput, in such a manner that it forms with the lateral part of the head towards the occiput an acute angle, which is subject to manifold individual In this position the concave surface of the auricle, tinned forwards and outwards, shows a number of irregular elevations and depress] ns 1 _ The outer margin of the cartilaginous plate is turned in towards the front, and forms the helix of the auricle Fig. 1, The helix, commencing at the crista helici-s. above the external orifice of the ear, in the most pronounced depression of the auricle (concha), extends from here along the margin of the auricle upwards and backwards, and ends as processus helicis above the posterior margin of the lobe. In parallel direction with the posterior part of the helix, and separated from it by a depression, the so-called t there extends a second elevation, the antihelix i&i. It commences above the crista helicis with two crura diverging forwards (crura bifurcata), and taking its course downwards, it passes with a slight curve forwards into a promi- nence of cartilage, the so-called arttitragus pposite to the last-named pait, and in front of the external orifice of the meatus, surmounting 11 the cartilage of the ear forms a second nipple-like projection directed back- wards, the tragus iri. which is separated from the antitragus by a notch (incisura vniertragica). Below this notch, forming the inferior extremity of the auricle, is the lobe dobulus. e\. which shows numerous individual var: and in whose formation only the integument covering the auricle takes pan.$