The elements of embryology (1883) The elements of embryology elementsofembryo00fost Year: 1883 132 THE THIRD DAY. Fig. 45. [chap, A L_^ Section through the dorsal region of an embryo Dog-Fish. 'pr. posterior root; spinal ganglion; n. nerve; x. attach- ment of ganglion to spinal cord; no. neural canal; m-p. muscle-plate ; ch. notochord ; i. investment of spinal cord. which subsequently join the posterior roots below the ganglia. The shape of the root of a completely formed spinal nerve, as it appears in an embryo of the fourth day, is represented in Fig. 68. The Eye. In the preceding
The elements of embryology (1883) The elements of embryology elementsofembryo00fost Year: 1883 132 THE THIRD DAY. Fig. 45. [chap, A L_^ Section through the dorsal region of an embryo Dog-Fish. 'pr. posterior root; spinal ganglion; n. nerve; x. attach- ment of ganglion to spinal cord; no. neural canal; m-p. muscle-plate ; ch. notochord ; i. investment of spinal cord. which subsequently join the posterior roots below the ganglia. The shape of the root of a completely formed spinal nerve, as it appears in an embryo of the fourth day, is represented in Fig. 68. The Eye. In the preceding chapter we saw how the first cerebral vesicle, by means of lateral outgrowths followed by constrictions, gave rise to the optic vesicles. These and the parts surrounding them undergo on the third day changes which result in the formation of the eyeball. At their first appearance the optic vesicles stand out at nearly right angles to the long axis of the embryo (Fig. 27), and the stalks which connect them
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