. The elements of embryology. Chickens -- Embryos. 114 THE THIRD DAT. [CHAP. are developed out of the mesoblastic investment of the vesicle, the (lymphatic) space between the osseous and membranous labyrinths being hollowed out of the mesoblast, and becoming rilled with perilymph as it is formed. The chief stages are as follows:— The form of the vesicle as seen in transverse sections of the head from being oval becomes somewhat triangular with the apex directed downwards (*. e. towards the ventral surface of the body). (Fig. 32.) The apex continues to develope until it becomes a some- what poi
. The elements of embryology. Chickens -- Embryos. 114 THE THIRD DAT. [CHAP. are developed out of the mesoblastic investment of the vesicle, the (lymphatic) space between the osseous and membranous labyrinths being hollowed out of the mesoblast, and becoming rilled with perilymph as it is formed. The chief stages are as follows:— The form of the vesicle as seen in transverse sections of the head from being oval becomes somewhat triangular with the apex directed downwards (*. e. towards the ventral surface of the body). (Fig. 32.) The apex continues to develope until it becomes a some- what pointed process directed inwards (Fig. 34, (7(7), and lying somewhat in front (nearer the face than) the rest of the vesicle, Fig. Section of the Head of a Fcetal Sheep (20 mm. in length). (Copied from Eoettclier.) Recessus "Vestibuli. V. B. Vertical semicircular canal. Horizontal semicircular canal. CC. Cochlear canal. 0. Cochlear eran< 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 Foster, M. (Michael), Sir, 1836-1907; Balfour, Francis M. (Francis Maitland), 1851-1882. London, Macmillan and co.
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherlondo, bookyear1874
