The principles and practice of surgery: embracing minor and operative surgery : with a bibliographical index of American surgical writers from the year 1783 to 1860 : arranged for the use of students (Volume 2) . Three different sizes of Wildes speculuni—\lf thesize, (brom the instrument.) A view of tlie vessels of the membraneof the tympanum. it is easy to recognize the condition of this membrane. The membrane oftjie tympanum or the drum of the ear is composed, according to the ex-tended researches of Toynbee, of the following layers: 1, an epidermis, whichis continuous with the epidermis
The principles and practice of surgery: embracing minor and operative surgery : with a bibliographical index of American surgical writers from the year 1783 to 1860 : arranged for the use of students (Volume 2) . Three different sizes of Wildes speculuni—\lf thesize, (brom the instrument.) A view of tlie vessels of the membraneof the tympanum. it is easy to recognize the condition of this membrane. The membrane oftjie tympanum or the drum of the ear is composed, according to the ex-tended researches of Toynbee, of the following layers: 1, an epidermis, whichis continuous with the epidermis of the external meatus and the cartilag-inous tube; 2, of the derm, which is also continuous with that lining thetube; 3, of a fibrous layer composed of radiating and circular fibres, andcontinuous with the periosteum of the osseous canal; and, 4, of a mucousmembrane, that is continuous with that lining the internal ear and throat ANATOMY OF THE EAR. 197 Though appearing as a bluish or gray seraitransparent membrane, the mem-brana tympani contains a fine network of vessels, as shown by Arnold in hisanatomical plates, as well as in Fig. 399, copied from Wilde. The outercircle of the figure is the bony r
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