On the use of an artificial membrana tympani in cases of deafness : dependent upon perforation or destruction of the natural organ : to which is added a paper entitled Ought the tonsils or uvula to be excised in the treatment of deafness? / by Joseph Toynbee.

  • Toynbee, Joseph, 1815-1866.
Date:
MDCCCLIII [1853]
Catalogue details

Licence: Public Domain Mark

Credit: On the use of an artificial membrana tympani in cases of deafness : dependent upon perforation or destruction of the natural organ : to which is added a paper entitled Ought the tonsils or uvula to be excised in the treatment of deafness? / by Joseph Toynbee. Source: Wellcome Collection.

Provider: This material has been provided by King’s College London. The original may be consulted at King’s College London.

    10/52 (page 8)
    structures may be readily separated. It consists, as its name implies, of circular fibres, wliicli are firm and strong at tbe circumference of the organ, but towards its centre become so attenuated as to require care in order to detect them. (Figure 4.) Tbe strong fibres at the circumference form a complete circle, and are attached to each side of the body of the malleus, as well as to the sides of the upper third of the processus longus. The circular fibrous layer is continuous with the periosteum of the tympanic cavity. E. The mucous layer lines the mner surface of the circular fibrous layer. Like the rest of the mucous membrane of the tympanum, it is very thin and deli- cate, and the epithelium covering it is composed of cells with cilise. It will be observed 5 #that of all the lamime composing the membrana tympani, none are ^ proper to it, but they are continua- tions of other structures. (Figure 5,*) In order to give a complete idea of the membrana tympani, it is desirable to add, in this place, a few words relative to the tensor tympani ligament. This structure is about three-fourths of a line in length, and is attached, internally, to the cochlearifonn pro- cess, and externally to the inner surface of the malleus at the junction of the long process with the neck. * a. The layer of the mucous membrane. b. The circular fibrous layer, c. The radiate fibrous layer.