. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. Uj- BoMY Cochlea of IIax. (After A. Eclijer.) A, axis ; Lso, Lso^, lamina spiralis ossea, the free edge of which, perforated by the fibres of the auditory nerve, is visible at t; H, hamulus. Fig. 186.— Transverse Section of the Cochlea ok \ Mammal. KS, bony cochlea ; Lo, Lo^, the two layers of the lamina spiralis ossea, between which at jVthe auditory neive (together with the ganglion, left of Z) is seen ; L, limbus laminse spiralis ; B, nienibrana basilaris, on which the neuro-epithe- lium lies ; B, Rei
. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. Uj- BoMY Cochlea of IIax. (After A. Eclijer.) A, axis ; Lso, Lso^, lamina spiralis ossea, the free edge of which, perforated by the fibres of the auditory nerve, is visible at t; H, hamulus. Fig. 186.— Transverse Section of the Cochlea ok \ Mammal. KS, bony cochlea ; Lo, Lo^, the two layers of the lamina spiralis ossea, between which at jVthe auditory neive (together with the ganglion, left of Z) is seen ; L, limbus laminse spiralis ; B, nienibrana basilaris, on which the neuro-epithe- lium lies ; B, Reissner's membrane; Sv, scala vestibula ; St, seali tympani; /S'(/j, scala media (membranous cochlea); C, membrane of Corti ; , liga- inentum spirale. the scala media does not by any means fill up the lumen of the bony cochlea, but that a cavity is left on either side of it, corresponding to those we have already met with in the auditory organ of Birds and known as the scala vestihuli and scala tympani (Figs. 179 and 186). Both of these are continuous with the perilymphatic cavity, and, following the direction of the scala media, open into one another at the blind end of the latter (Fig. 179). The scala vestihuli is shut off from the tympanic cavity by the membrane of the fenestra ovalis, to which the stapes is applied externally; the scala tympani is closed by the membrane of the fenestra rotunda. On the fioor of the bony cochlea, not far from the fenestra rotunda, is an opening leading into a narrow canal, the dtictus perilympliaticus, which serves as a communication between the perilymphatic cavity and the peripheral lymphatic trunks of the head (Fig. 179).i The fibres df the auditory nerve running along the axis of the bony cochlea extend in their course laterally outwards, between the two plates ' A ductus perilympliaticus can be plainly made out from Reptiles Please note that these images are extracted from scanned page images that may have been digitally enh
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanatomycomparative
