. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. THE INTERNAL EAR 439 fluid known as the perilymph, the space occupied by the fluid being the perilymphatic space; the outer fibrous layer becomes peri- chondrium and later periosteum; and the precartilage undergoes chondrification and later ossifies to form the petrous portion of the temporal bone. The gelatinous layer completely surrounds most of the otocyst structures, which thus come to lie free in the perilymphatic space, but in the cochlear region the conditions are somewhat different. I
. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. THE INTERNAL EAR 439 fluid known as the perilymph, the space occupied by the fluid being the perilymphatic space; the outer fibrous layer becomes peri- chondrium and later periosteum; and the precartilage undergoes chondrification and later ossifies to form the petrous portion of the temporal bone. The gelatinous layer completely surrounds most of the otocyst structures, which thus come to lie free in the perilymphatic space, but in the cochlear region the conditions are somewhat different. In this region the gelatinous layer is interrupted along two lines,. Fig. 261.—Diagrammatic Transverse Section through a Coil of the Cochlea showing the relation of the scal^e. c, Organ of Corti; co, ganglion cochleare; Is, lamina spiralis; SAT, cochlear duct; ST, scala tympani; SV, scala vestibuli.—(From Gerlach.) an outer broad one where the connective-tissue wall of the cochlear duct is directly continuous with the perichondrium layer, and an inner narrow one, along which a similar fusion takes place with the perichondrium of a shelf-like process of the cartilage, which later ossifies to form the lamina spiralis. Consequently throughout the cochlear region the perilymphatic space is divided into two compart- ments which communicate at the apex of the cochlea, while below one, known as the scala vestibuli, communicates with the space. 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 McMurrich, J. Playfair (James Playfair), 1859-1939. Philadelphia : P. Blakiston's son & co.
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Keywords: ., bookautho, bookcentury1900, bookdecade1910, booksubjectembryology
