. The anatomy of the horse; a dissection guide. Horses. THE EAR. 271 of the cochlea is a lamina, or shelf, of bone—tei'med the osseous spiral lamina. The tube is thus imperfectly divided into two passages, termed respectively the scala timpani and the scala vestibuli. The separation between these two passages is rendered moi-e complete, and a third passage is marked off, by certain membranous structures. These are the basilar membr^ane 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 thickeni
. The anatomy of the horse; a dissection guide. Horses. THE EAR. 271 of the cochlea is a lamina, or shelf, of bone—tei'med the osseous spiral lamina. The tube is thus imperfectly divided into two passages, termed respectively the scala timpani and the scala vestibuli. The separation between these two passages is rendered moi-e complete, and a third passage is marked off, by certain membranous structures. These are the basilar membr^ane 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 Sjyiral ligament. Reissnerh Membrane is much more delicate, and stretches from the adsta spiralis at the free edge of the osseous spiral lamina, obliquely upwards and outwards to the wall of the Fig. 35. Transverse Section through the Tube of the Cochlea. ill. Modiolus ; O. Outer wall of cochlea; SV. Scala vestibuli; ST. Scala tympani; DC. Ductus cochlearis; »)iR. Membrane of Reissner ; bm. Basilar membrane; sc. Crista spiralis; si. Spiral liga- ment ; sg. Spiral ganglion of auditory nerve ; oc. Organ of Corti {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 Avith 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, 1853-1941. New York, Jenkins
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Keywords: ., bookcentury1800, bookdecade1880, booksubjecthorses, bookyear1884
