. The anatomy of the horse, a dissection guide. Horses. THE EAR. 271 of the cochlea is a lamina, or shelf, of bone—termed the osseous spiral lamina. The tube is thus imperfectly divided into two passages, termed respectively the scala tympani and the seala vestibuli. The separation between these two passages is rendered more complete, and a third passage is marked off, by certain membranous structures. These are the basilar memhrane and Beissner's membrane. The basilar membrane stretches from the free edge of the osseous spiral lamina to the outer wall of the tube, where it joins a thickening
. The anatomy of the horse, a dissection guide. Horses. THE EAR. 271 of the cochlea is a lamina, or shelf, of bone—termed the osseous spiral lamina. The tube is thus imperfectly divided into two passages, termed respectively the scala tympani and the seala vestibuli. The separation between these two passages is rendered more complete, and a third passage is marked off, by certain membranous structures. These are the basilar memhrane and Beissner's membrane. The basilar membrane stretches from the free edge of the osseous spiral lamina to the outer wall of the tube, where it joins a thickening of the lining of the tube, termed the spiral ligament. Beissner's Membrane is much more delicate, and stretches from the crista spiralis at the free edge of the osseous spiral lamina, obliquely upwards and outwards to the wall of the tube. =iA-^=SQ-P;;-, „, _^. Fig. 35. Teansvebsb Section through the Tube of the Cochlea. m Modiolus- O. Outer waU of cochlea; SV. Scala vestibuli; ST. Scala tympani; DC. Ductus rophleariT-mR. Membrane of Reissner; hm. Basilar membrane; M^Crista spiralis; si. Spiral liga- ment?"^ Spiral ganglion of auditory nerve; oc. Organ of Cprti (Turner). The tube is thus divided into three passages, viz., the scala tympani, the scala vestibuli, and the scala intermedia. The Scala Tympani is the largest of the three passages, and is separated from the other two by the osseous spiral lamina and the basilar membrane. At the base of the cochlea it begins at the fenestra rotunda by which, in the dried bone, it communicates with the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original McFadyean, John, Sir, 1853-. Edinburgh and London, W. & A. K. Johnston, Ltd.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjecthorses, bookyear1884
