A text-book of the diseases of the ear for students and practitioners . e motor portion of the fifthcranial nerve. 2. That the central fibres of the stapedius are supplied by the seventhcranial nerve. These results have been corroborated by the embryologicalinvestigations of Eabl. * Compare the complete account of these experiments given in the reportsof the Wiener Academic der Wissenschaften, March 14, 1861. THE LINING OF THE TYMPANIC CAVITY 35 (I) The Lining of the Tympanic Cavity. The lining membrane of the tympanic cavity in the adultappears as a thin transparent pellicle; it is intimately
A text-book of the diseases of the ear for students and practitioners . e motor portion of the fifthcranial nerve. 2. That the central fibres of the stapedius are supplied by the seventhcranial nerve. These results have been corroborated by the embryologicalinvestigations of Eabl. * Compare the complete account of these experiments given in the reportsof the Wiener Academic der Wissenschaften, March 14, 1861. THE LINING OF THE TYMPANIC CAVITY 35 (I) The Lining of the Tympanic Cavity. The lining membrane of the tympanic cavity in the adultappears as a thin transparent pellicle; it is intimately con-nected with some parts of the osseous walls, especially theinferior and superior, while on other parts, for example thepromontory, it is more easily detached. This membrane showsa great similarity to the mucous membrane of the accessorysinuses of the nose. The epithelium of the mucous membranein the inferior portion of the tympanum is of the ciliatedcylindrical variety, and gradually passes into the ciliatedsquamous variety in the superior part of this cavity. .. -b Wimmm ill Fig. 41.—Section of the Lining Membrane of the Inner Wall ofthe Tympanic Cavity. a, Epithelium ; b, Section of a bloodvessel in the stratum of connective tissue, fromwhich a branch penetrates into the funnel-shaped depressions of the bone ; c, Blood-vessel on the surface, penetrating into the bone ; d, d, Osseous wall; e, e, Funnel-shaped depressions in the bone, into which the stratum of connective tissue of thelining membrane penetrates ; /, Section of a large nerve trunk in the stratum ofconnective tissue of the lining membrane. (Decalcified and prepared with osmicacid.) The connective tissue stratum of this mucous membrane(Fig. 41), in which bloodvessels, lymphatics and nerves ramify,is composed of two layers, the inferior of which must be con-sidered as the periosteum of the osseous wall. The author found( 0., vol. v.), especially, on the ridgy inferior and anteriorwalls, networks of fib
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