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GrayAnatomy 5 Fertilization consists in the union of the spermatozoön with the mature ovum (Fig. 8). Nothing is kn 3 61 show
GrayAnatomy 2 THE TERM Embryology, in its widest sense, is applied to the various changes which take place during 3 310 show
GrayAnatomy 7 In front of the primitive streak two longitudinal ridges, caused by a folding up of the ectoderm, ma 3 132 show
GrayAnatomy 6 The early segmentation of the human ovum has not yet been observed, but judging from what is known t 3 358 show
GrayAnatomy 4 The spermatozoa or male germ cells are developed in the testes and are present in enormous numbers i 3 113 show
GrayAnatomy 3 The ova are developed from the primitive germ cells which are imbedded in the substance of the ovari 3 171 show
GrayAnatomy 9 Toward the end of the second week transverse segmentation of the paraxial mesoderm begins, and it is 3 40 show
GrayAnatomy 8 The notochord (Fig. 19) consists of a rod of cells situated on the ventral aspect of the neural tube 3 68 show
GrayAnatomy 14 In the human embryo described by Peters the mesoderm outside the embryonic disk is split into two la 3 190 show
GrayAnatomy 15 —It is during this month that the first movements of the fetus are usually observed. The eruption of 3 60 show