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.

  • Politzer, Adam, 1835-1920.
Date:
1894
Catalogue details

Licence: Public Domain Mark

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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    a. Its Cartilaginous Portion. The cartilaginous meatus is a tubular continuation of the auricle directed inwards. This canal, however, is not cartilaginous in its whole extent, but consists of a cartilaginous channel, which is formed at its upper and back part into a tube by a membranous layer connected with the lining membrane of the meatus. The circumference of the car- tilaginous channel (Fig. 2) appears largest at its outer extremity, while inwards the width of the cartilage gradually decreases, so that the inner extremity (b) ap- pears as a narrow, rounded, cartilaginous point. This proportion of the cartilaginous channel to the membranous part of the passage can be shown in a simple manner by sections (Figs. 3, 4. 5) which are made perpendicularly to the axis of the cartilaginous meatus at the outer, middle, and inner portions. We see. therefore, that the membranous portion (fi in Figs. 3, 4. 5) increases in breadth towards the interior, while the cartilage decreases. The length of the lower cartilaginous wall from the en- trance of the meatus to the point of the cartilage varies from 10 to 11 mm. The channel of the cartilaginous portion of the meatus, which varies in thickness in different places from 1 to 3 mm., is traversed transversely by ah , h Fig. 2.—Auricle and Cartilaginous Meatus. a, Cartilaginous meatus : 6, Interior pointed extremity of the cartilaginous meatus ; c, c, Fissures of Santorini (left ear). Fig. 3.—Section of the Cartilaginous Meatus close behind the Orifice of the External Meatus. a. a, a, Cartilaginous chan- nel ; b, Fibrous la) er. Fig.4 — Section through the Middle of the Cartilaginous Mea- tus. «, a, a, Cartilaginous channel : bt Fibrous layer. a Fig. 5.—Section in thk Neighbourhood of the Interior Extre- mity of the Cartila- ginous Meatus. a, Cartilage ; b, Fibrous laver. several fissures, the so-called fissures of Santorini (Fig. 2. c, c). As a rule, two large fissures are found. These are. however, by no means regular and constant in direction or extent. They are filled up by a fibrous tissue, which often contains small bundles of muscular tissue, and allows an anastomosis of