Lectures on diseases and injuries of the ear : delivered at St. George's Hospital / by W.B. Dalby.
- William Bartlett Dalby
- Date:
- 1885
Licence: Public Domain Mark
Credit: Lectures on diseases and injuries of the ear : delivered at St. George's Hospital / by W.B. Dalby. Source: Wellcome Collection.
63/292 (page 47)
![a continuation of tlie skin which hues the meatus. Between these two comes the membrane proper, com- posed of outer radiating fibres derived from the periosteal lining of the external meatus, and inner circular fibres from the periosteum of the tympanum. The cm-vature of the membrane is not, strictly speaking, a concavity, but rather a tucking in; for the parts not dragged upon by the handle of the malleus show an inclination rather the other way. Very soon after death the membrane loses its lustre, so that examinations conducted with a view of con- trasting healthy with diseased appearances must be made on the living. As you reflect light from this mirror down the speculum, and look through the hole in the mirror, you will see the tympanic membrane at the bottom of the auditory canal. It is, you obse]*ve, translucent, lustrous, and of a bright slate colour. At the upper part is the short process of the malleus shining through and pressing on the membrane, and just above this process, that is at the superior and an- terior portion of the membrane, must be noticed a small depression. This is termed the membrane of Sclirapuell, and covers a small space which communi- cates more or less with the tympanic cavity. This small space and the membrane covering it have an especial importance, as will be seen when we consider the results of inflammation of the tympanum. Passing down the middle from above is the handle of the malleus, terminating in what is called the umbo. From this downwards and forwards is seen what is spoken of as the bright spot. This appearance, ob-](https://iiif.wellcomecollection.org/image/b20387167_0063.jp2/full/800%2C/0/default.jpg)
