The elements of Embryology, (1874) The elements of Embryology, elementsofembryo74fost Year: 1874 lU THE THIRD DAY. [chap. are developed out of tlie mesoblastic investment of the vesicle, the (lymphatic) space between the osseous and membranous labyriuths being hollowed out of the mesoblast, and becoming filled 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 [i. e. towards the ventral surface of the body). (Fig. 32.) The apex continu
The elements of Embryology, (1874) The elements of Embryology, elementsofembryo74fost Year: 1874 lU THE THIRD DAY. [chap. are developed out of tlie mesoblastic investment of the vesicle, the (lymphatic) space between the osseous and membranous labyriuths being hollowed out of the mesoblast, and becoming filled 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 [i. 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, CG), and lying somewhat in front (nearer the face than) the rest of the vesicle, Fig. 35. Section of the Head or a Fcetal Sheep (20 aim. in length), (Copied from Boettoher.) R. V. Eecessus Veatibuli. Vertical semicircular canal. Horizontal semicircular canal. Cochlear canal. G. Cochlear ganglion.
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