Archive image from page 443 of The development of the human. The development of the human body : a manual of human embryology . developmentofhum00mcmu Year: 1914 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, accor
Archive image from page 443 of The development of the human. The development of the human body : a manual of human embryology . developmentofhum00mcmu Year: 1914 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
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