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source DB source ID text size # proj. # Ann.
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 13 The mandibular arch lies between the first branchial groove and the stomodeum; from it are developed 12.7 KB 3 252 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 36 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 3 The ova are developed from the primitive germ cells which are imbedded in the substance of the ovari 7.71 KB 3 107 show
GrayAnatomy 4 The spermatozoa or male germ cells are developed in the testes and are present in enormous numbers i 4.67 KB 3 69 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 3 180 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 12 In reptiles, birds, and many mammals the allantois becomes expanded into a vesicle which projects in 21.3 KB 3 373 show