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GrayAnatomy 6 The early segmentation of the human ovum has not yet been observed, but judging from what is known t 4 540 show
GrayAnatomy 13 The mandibular arch lies between the first branchial groove and the stomodeum; from it are developed 4 752 show
GrayAnatomy 3 The ova are developed from the primitive germ cells which are imbedded in the substance of the ovari 4 321 show
GrayAnatomy 5 Fertilization consists in the union of the spermatozoön with the mature ovum (Fig. 8). Nothing is kn 4 108 show
GrayAnatomy 11 The yolk-sac (Figs. 22 and 23) is situated on the ventral aspect of the embryo; it is lined by entod 4 81 show
GrayAnatomy 12 In reptiles, birds, and many mammals the allantois becomes expanded into a vesicle which projects in 4 1122 show
GrayAnatomy 14 In the human embryo described by Peters the mesoderm outside the embryonic disk is split into two la 4 228 show
GrayAnatomy 15 —It is during this month that the first movements of the fetus are usually observed. The eruption of 4 92 show
GrayAnatomy 4 The spermatozoa or male germ cells are developed in the testes and are present in enormous numbers i 4 207 show
GrayAnatomy 7 In front of the primitive streak two longitudinal ridges, caused by a folding up of the ectoderm, ma 4 159 show