. A text-book of embryology for students of medicine [electronic resource]. Embryology; Embryology. THE INTERNAL EAR. 353 The cochlea consists now of a spirally coiled epithelial tube lying within an elongated cavity in the cartilaginous petrosa, a cavity, the walls of which' are, therefore, cartilaginous. The peripheral wall of the coiled tube is in contact with the inner surface of the wall of the cartilaginous capsule (Fig. 169, x)j a fact which has an important bearing upon the further stages of Fig. 169.—Part of a section through the cochlea of an embryo cat, 9 cm. ( in.) long
. A text-book of embryology for students of medicine [electronic resource]. Embryology; Embryology. THE INTERNAL EAR. 353 The cochlea consists now of a spirally coiled epithelial tube lying within an elongated cavity in the cartilaginous petrosa, a cavity, the walls of which' are, therefore, cartilaginous. The peripheral wall of the coiled tube is in contact with the inner surface of the wall of the cartilaginous capsule (Fig. 169, x)j a fact which has an important bearing upon the further stages of Fig. 169.—Part of a section through the cochlea of an embryo cat, 9 cm. ( in.) long (after Boettcher): kk, cartilaginous capsule, in which the cochlear duct describes ascending spiral turns; dc, ductus cochlearis; c, organ of Corti; Iv, lamina vestibularis; x, outer wall of the membranous ductus cochlearis with liga- mentura spirale; SV, scala vestibuli; ST, ST', scala tympani; g, gelatinous tissue, which still fills the scala vestibuli (sv') in its last turns; g', remnant of the gela- tinous tissue, which is not yet liquefied ; M, firm connective tissue surrounding the cochlear nerve (nc); gsp, ganglion spirale; N, nerve which runs to Corti's organ in the future lamina spiralis ossea; Y, compact connective-tissue layer,which becomes ossified and shares in bounding the bony cochlear duct; P, perichon- drium. The embryonal connective tissue within the capsule now undergoes important modifications, which vary greatly in dif- ferent regions. That portion of this tissue which immediately envelops the cochlear nerve becomes first dense connective 23. 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 Heisler, John Clement; Waterstone, David, former owner; Duke-Elder, Stewart, 1898-1978, former owner; University College, London. Library Services. Philadelphia : W. B. Saunders Company
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