Textbook of normal histology: including an account of the development of the tissues and of the organs . Sagittal section through developing earof ten-day rabbit embryo: o, otic vesiclebecoming pear-shaped, due to formationof recessus vestibuli (r) ; m, surroundingmesoderm. Section through developing ear of twelve-dayrabbit embryo: v, primitive vestibule, fromwhich extend (r) recessus labyrinthi and (s)semicircular canal above and (c) cochlear canalbelow ; n, neural tube with thickened ventrallining ; m, mesoderm. rinth disproportionately conspicuous compared with its permanentrepresentative,
Textbook of normal histology: including an account of the development of the tissues and of the organs . Sagittal section through developing earof ten-day rabbit embryo: o, otic vesiclebecoming pear-shaped, due to formationof recessus vestibuli (r) ; m, surroundingmesoderm. Section through developing ear of twelve-dayrabbit embryo: v, primitive vestibule, fromwhich extend (r) recessus labyrinthi and (s)semicircular canal above and (c) cochlear canalbelow ; n, neural tube with thickened ventrallining ; m, mesoderm. rinth disproportionately conspicuous compared with its permanentrepresentative, the ductus endolymphaticus. THE ORGAN OF HEARING. 300 The semicircular canals next form as tubular projections fromthe vesicle and rapidly assume great prominence ; the superiorvertical canal appears first, and the external or horizontalcanal last. The growth of the epithelial diverticula is later accom-panied by a condensation of the surrounding mesoderm, whichdifferentiates into an external layer, the future cartilaginous andlater bony capsule, and an inner layer of fibrous tissue. The lattersuffe
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Keywords: ., bookauthorpiersolgeorgeageorgea, bookcentury1800, bookdecade1890
