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GrayAnatomy 12 In reptiles, birds, and many mammals the allantois becomes expanded into a vesicle which projects in 21.3 KB 3 380 show
GrayAnatomy 11 The yolk-sac (Figs. 22 and 23) is situated on the ventral aspect of the embryo; it is lined by entod 1.63 KB 3 27 show
GrayAnatomy 5 Fertilization consists in the union of the spermatozoön with the mature ovum (Fig. 8). Nothing is kn 2.71 KB 3 39 show
GrayAnatomy 14 In the human embryo described by Peters the mesoderm outside the embryonic disk is split into two la 3.9 KB 3 76 show
GrayAnatomy 7 In front of the primitive streak two longitudinal ridges, caused by a folding up of the ectoderm, ma 2.79 KB 3 53 show
GrayAnatomy 8 The notochord (Fig. 19) consists of a rod of cells situated on the ventral aspect of the neural tube 1.23 KB 3 26 show
GrayAnatomy 15 —It is during this month that the first movements of the fetus are usually observed. The eruption of 1.76 KB 3 29 show
GrayAnatomy 10 The embryo increases rapidly in size, but the circumference of the embryonic disk, or line of meetin 1.89 KB 3 32 show
GrayAnatomy 9 Toward the end of the second week transverse segmentation of the paraxial mesoderm begins, and it is 1.21 KB 3 18 show
GrayAnatomy 6 The early segmentation of the human ovum has not yet been observed, but judging from what is known t 9.42 KB 3 182 show