File:A text-book of the diseases of the ear and adjacent organs (1894) (14778298031).jpg

Identifier: adjacendis00poli (find matches)
Title: A text-book of the diseases of the ear and adjacent organs
Year: 1894 (1890s)
Authors: Politzer, Adam, 1835-1920 Dodd, Oscar Dalby, William B. (William Bartlett), Sir, 1840-1918
Subjects: Ear Diseases
Publisher: 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:
t, especially in the new-born infant, astrongly developed cutaneous band extends from the superior wall of the• xternal meatus to the membrana tympani and behind the handle of themalleus, so that between the handle and the cutaneous band there is left a 2 18 MICROSCOPIC ANATOMY OF THE MEMBKANA TYMPANI. triangular transparent space, directed with its apex towards the extremity ofthe handle ; with this cutaneous band, consisting of connective tissue andelastic fibres (Prussaks descending fibres), there also extend vessels andnerves from the meatus to the membrana tympani. At the inferior andWidened extremity of the handle of the malleus, the ligamentous fibres ofthis bundle radiate towards the periphery, and partly unite with the fibres ofthe substantia propria. The middle fibrous layer consists of two separable lamellae, an externalradiating layer, and an internal circular layer. The pale, filamentous anddelicately defined fibres of these two layers form a tissue, which, according to
Text Appearing After Image:
Pig. 19.—Section through the Malleus and the Posterior Tympanic Pouchat the Level of the Short Process of the Malleus. /t. Malleus; br, Cartilaginous portion of its short process; tr, Posterior portion ofthe tympanic membrane; fa, Posterior fold of the tympanic membrane ; fa.Posterior pouch of Von Troltsch ; 8, Mucous lining of the tympanic cavity. Gerlach, is, so to say, midway between the usual fibrillated and the homo-geneous connective tissue of Eeichert. According to the embryological inves-tigations of Draispul the lamina propria of the membrana tympani is adirect continuation of the periosteum of the annulus tvmpanicus. The outerradiating fibres partially cross, and are principally at the lower part, andattached to the enlarged end of the handle of the malleus (Fig. 20, v). Inthe upper portion are only a few fine fibres at the anterior border of thehandle of the malleus. They become at the same time more dense towardsthe centre, partly because they multiply by splitting of th

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