A text-book of the diseases of the ear and adjacent organs . re of the inner wall of the cavum tympani showmany variations which must be borne in mind by ocular inspection oroperative procedures. The long process of the incus and its articulation,with the stapes, often lie so low that the greater part of the niche of thefenestra ovalis, with the posterior crura of the stapes and stapedius tendon, iseasily visible ; in other cases this connection of the incus and stapes is so Fig. 56.—Projection of the innerWall of the Tympanic Cavitywith respect to the MembranaTympani. a, Ant. sup. quadrant of
A text-book of the diseases of the ear and adjacent organs . re of the inner wall of the cavum tympani showmany variations which must be borne in mind by ocular inspection oroperative procedures. The long process of the incus and its articulation,with the stapes, often lie so low that the greater part of the niche of thefenestra ovalis, with the posterior crura of the stapes and stapedius tendon, iseasily visible ; in other cases this connection of the incus and stapes is so Fig. 56.—Projection of the innerWall of the Tympanic Cavitywith respect to the MembranaTympani. a, Ant. sup. quadrant of membranatympani; b, Ant. inf. quadrant ofmembrana tympani ; c, Post. of membrana tympani ; d,Post. inf. quadrant of membranatympani ; e, Niche of the fenestrarotunda. * Realencyclopiidie der vied. Wissenschaften. Wien, 1866. Article Gehororgan. TOPOGRAPHY OF THE SOUND-CONDUCTING APPARATUS. 53 high that it is completely hid from view by the annulus tympanicus, or onlyvisible by complete destruction of the membrana tympani. The niche of / h k. o d c I Fig. 57.—Vertical Section op the External Meatus, Membrana Tympani, and Tympanic Cavity. a, Cellular spaces in the superior wall of the meatus, connected with the middle ear ;b, Roof of the tympanic cavity; c, Inferior wall; d, Tympanic cavity ; e, Mem-brana tympani ; /, Head of the malleus; g, Handle of the malleus ; h, Incus ;i, Stapes ; k, Canalis Fallopiae ; I, Fossa jugularis ; m, Glandular orifices in theexternal meatus. (Right ear.) the fenestra rotunda often is so low that it appears to lie in the region ofthe post, infer, quadrant only. Since the membrana is bulged inwards in a funnel-shape, and the inner h d I
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Keywords: ., bookcentury1800, bookdecade1890, booksubjecteardiseases, bookyear
