A text-book of the diseases of the ear and adjacent organs . usmembrane of the cavum tympani, and consequently it cannot be consideredi structural peculiarity of the membrana tympani. LYMPHATIC VESSELS AND NERVES OF THE MEMBKANA TYMPANI. 21 The nerves of the membrana tympani, which, according to Arnold, springfrom thevervus temporalis sv^erficialis of the tritjeminus, but which wereminutely examined for the first time by v. Troltsch, are spread out on theexternal layer, parallel with the vessels, in the form of three or four verydelicate, ill-defined branches, the terminations of which are, so
A text-book of the diseases of the ear and adjacent organs . usmembrane of the cavum tympani, and consequently it cannot be consideredi structural peculiarity of the membrana tympani. LYMPHATIC VESSELS AND NERVES OF THE MEMBKANA TYMPANI. 21 The nerves of the membrana tympani, which, according to Arnold, springfrom thevervus temporalis sv^erficialis of the tritjeminus, but which wereminutely examined for the first time by v. Troltsch, are spread out on theexternal layer, parallel with the vessels, in the form of three or four verydelicate, ill-defined branches, the terminations of which are, so far, saya that he has sometimes observed round the vessels and betweentheir meshes a large nervous plexus and gangliar swellings on the nerve-Bbres. In the rete Malpitjlui there is a second plexus supplied with multipola rcells. The nerve-fibres of the cutis, while regularly dividing dichotomously,penetrate the substantia propria and come into connection with the nervousplexus of the lining membrane. Gerlach observed delicate non-medullated. Fig 21.—Fibrous Framework of the Posterior Segment of the InteriorSurface of the Membrana Tympani in the Adult. f(, < Treat interspace in the framework ; b, Small interspace, through which a thinprocess passes ; c, Arch formed by radiating processes. nerve-fibres in the covering of the lining membrane. Forming the externalwall of the cavum tympani, besides the membrana tympani, is a margin ofbone; bordering on it and above is a smooth cup-shaped niche, which servesto hold the bodies of the hammer and incus (Logette des Osselets, Gelle). b. Superior Wall of the Tympanic Cavity. The superior wall, or roof, of the tympanic cavity is formed by an osseousplate, continuous with the superior surface of the pyramid. This plate extendsbeyond the boundaries of the tympanic cavity, forming not only a part of thesuperior lamella of the osseous meatus, but also the upper wall of the mastoid 22 SUPERIOK WALL OF THE TYMPANIC CAVITY an
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Keywords: ., bookcentury1800, bookdecade1890, booksubjecteardiseases, bookyear
