. The pathological anatomy of the ear . th the labyrinth-wall aroundthe insertion of the polypus. Hinton found a small fibroma arising from thechorda tympani and Professor Koeppe informs methat he has seen a gumma on the same spot. Cholesteatoma, pearl-tumor, has already been fullydescribed on page 22. Exostoses occur on the tympanic walls and on theossicles. On the floor of the cavity and on the loweredge of the promontory, they occur as normal forma-tions, like osteophytes, in the form of sharp pointsand osseous bridges; but they are also found in theseshapes as pathological formationson oth
. The pathological anatomy of the ear . th the labyrinth-wall aroundthe insertion of the polypus. Hinton found a small fibroma arising from thechorda tympani and Professor Koeppe informs methat he has seen a gumma on the same spot. Cholesteatoma, pearl-tumor, has already been fullydescribed on page 22. Exostoses occur on the tympanic walls and on theossicles. On the floor of the cavity and on the loweredge of the promontory, they occur as normal forma-tions, like osteophytes, in the form of sharp pointsand osseous bridges; but they are also found in theseshapes as pathological formationson other parts, as the promontory,the neighborhood of the fenestrarotunda and eminentia pyramid-alis, where they are the results ofchronic periostitis. If the drum-Fig. 62. membrane has been partially de-Exostoses of the Laby- stroyed, tlicy may be visible on rinth-wall, visible tlirough . „ , . ?, a perforation of the Drum- mspectlOn. OsSCOUS bridgCS are membrane. souietimcs fouud bctwceu the eminentia pyramidalis and fenestra THE TYMPANUM. 120 Zaufal describes and figures an extensive, com-pact exostosis, arising from the posterior wall of thetympanum and the wall of the fossa jugularis, whichhad closed the fenestra rotunda and produced partialabsorption of the sulcus pro membrana tjnnpani.^ Hyperostosis of the fenestra rotunda produces aslit-like narrowing and, in its highest degrees, com-plete closure of this opening, as was well known tothe older observers.^ If the hyperostosis of the tym-panic walls is equally distributed a marked narrowingof the tympanum results. Cysts. A retention-cyst lined with epithelium andfilled with rhombic tables of fat-crystals has been de-scribed by me ; ^ it was apparently developed from atubular mucous gland of the tympanic mucous mem-brane. Politzer^ has seen cyst-like formations aris-ing from the mucosa of the drum-membrane, con-sisting of a sack with thick fluid contents. Toynbeeand Hinton have described cases of sebaceous tumorsor de
Size: 1617px × 1545px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, bookidpa, booksubjecteardiseases
