A text-book of the diseases of the ear for students and practitioners . Fig. 69.—Normal Mem- Fig. 70.—Normal Mem- brana tympani of the brana tynpani of the Eight Ear. Left Ear. (Double the natural size.) small cartilaginous cells round the lower extremity of the manu-brium. A linear opacity, corresponding to the annulus tendinosus,is often seen at the anterior inferior periphery of the membrane. Lustre.—The lustre of the membrana tympani is pronouncedat the sharply defined triangular cone of light at its anteriorinferior quadrant (Figs. 69 and 70). This light-reflex commenceswith its apex in f
A text-book of the diseases of the ear for students and practitioners . Fig. 69.—Normal Mem- Fig. 70.—Normal Mem- brana tympani of the brana tynpani of the Eight Ear. Left Ear. (Double the natural size.) small cartilaginous cells round the lower extremity of the manu-brium. A linear opacity, corresponding to the annulus tendinosus,is often seen at the anterior inferior periphery of the membrane. Lustre.—The lustre of the membrana tympani is pronouncedat the sharply defined triangular cone of light at its anteriorinferior quadrant (Figs. 69 and 70). This light-reflex commenceswith its apex in front of the umbo, and enlarging as it extendsforwards and downwards, forms an obtuse angle with the handleof the malleus. The greater the inclination of the tympanicmembrane to the axis of the auditory canal, the smaller will bethe angle formed by the handle of the malleus and the coneof light. The shape of this light-reflex exhibits manifold variations,which are caused partly by the differences in the inclination ofthe membrane and partly by changes in its cur
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectear, booksubjecteardi
