. A Reference handbook of the medical sciences : embracing the entire range of scientific and practical medicine and allied science. ed position, but the ten-sion of the circular fibres. In addition to the two layersof the membrana propria, just described, there is stillanother layer composed of descending fibres (Gruber).They are external to the radial fibres, arise from theupper segment of the annulus tendinosus, and lying veryclose to one another, are inserted into the sides andmedian line of the cartilaginous groove of the three layers of fibres entering into the compositionof
. A Reference handbook of the medical sciences : embracing the entire range of scientific and practical medicine and allied science. ed position, but the ten-sion of the circular fibres. In addition to the two layersof the membrana propria, just described, there is stillanother layer composed of descending fibres (Gruber).They are external to the radial fibres, arise from theupper segment of the annulus tendinosus, and lying veryclose to one another, are inserted into the sides andmedian line of the cartilaginous groove of the three layers of fibres entering into the compositionof the membrana propria are lightly bound together bya very delicate connective tissue, but they cling veryclosely to the annuhis tendinosus, cartilaginous groove,and the dermoid and mucous layers. There is also in the membrana tympani a set of fibresarranged in a peculiar way, and first described andnamed by Gruber—the dendritic (arborescent) fibrous struc-ture of the tympanic membrane. They arise near theperiphery, about in the middle of the posterior segment,pretty far apart, but as they proceed on their upwardVol. VII.—22. View of Inner Surface ofMembrana Tympani. (Giuber.) A,Manubrium of the malleus ; B, thelower end of the manubrium; C,head of the malleus ; D, body of theincus; E, short process of the incus ;F, processus lenticularis of the in-cus ; O H, chorda tympani; /. inser-tion of the tensor tympani muscle. course in the posterior segment, they approach oneanother in order to divide again, at some distance fromthe manubrium of the malleus, into several branches,usually about three, which run in different directions,and are finally lost by intertwining with the fibres of themembrana propria. 8 These fibres are not confined tothe posterior segment, but traces of them are foundthroughout the membrana tympani. The function ofthese fibres is considered by Gruber to be, in all proba-bility, to relax the tympanic membrane, although it can-not be shown as yet that it is mu
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectmedicine, bookyear188
