. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. 432 THE INTERNAL EAR least, confirmed by the embryonic development. The inner ear, which is the sensory portion proper, is an ectodermal structure, which secondarily becomes deeply seated in the mesodermal tissue of the head, while the middle and outer ears, which provide the apparatus necessary for the conduction of the sound-waves to the inner ear, are modified portions of the anterior branchial arches. It will be convenient, accordingly, in the description of the ear, to accept the usually
. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. 432 THE INTERNAL EAR least, confirmed by the embryonic development. The inner ear, which is the sensory portion proper, is an ectodermal structure, which secondarily becomes deeply seated in the mesodermal tissue of the head, while the middle and outer ears, which provide the apparatus necessary for the conduction of the sound-waves to the inner ear, are modified portions of the anterior branchial arches. It will be convenient, accordingly, in the description of the ear, to accept the usually recognized divisions and to consider first of all the development of the inner ear, or, as it is better termed, the otocyst. The Development of the Otocyst.—In an embryo of mm. a pair of pits occur upon the surface of the body about opposite the middle portion of the hind-brain (Fig. 254, A). The ectoderm lining the pits is somewhat thicker than is the neighboring ectoderm. 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.
Size: 1345px × 1857px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookautho, bookcentury1900, bookdecade1910, booksubjectembryology
