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GrayAnatomy 2 THE TERM Embryology, in its widest sense, is applied to the various changes which take place during 3 129 show
GrayAnatomy 15 —It is during this month that the first movements of the fetus are usually observed. The eruption of 3 29 show
GrayAnatomy 9 Toward the end of the second week transverse segmentation of the paraxial mesoderm begins, and it is 3 18 show
GrayAnatomy 11 The yolk-sac (Figs. 22 and 23) is situated on the ventral aspect of the embryo; it is lined by entod 3 27 show
GrayAnatomy 4 The spermatozoa or male germ cells are developed in the testes and are present in enormous numbers i 3 69 show
GrayAnatomy 5 Fertilization consists in the union of the spermatozoön with the mature ovum (Fig. 8). Nothing is kn 3 36 show
GrayAnatomy 10 The embryo increases rapidly in size, but the circumference of the embryonic disk, or line of meetin 3 32 show
GrayAnatomy 6 The early segmentation of the human ovum has not yet been observed, but judging from what is known t 3 180 show
GrayAnatomy 14 In the human embryo described by Peters the mesoderm outside the embryonic disk is split into two la 3 76 show
GrayAnatomy 7 In front of the primitive streak two longitudinal ridges, caused by a folding up of the ectoderm, ma 3 53 show