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GrayAnatomy 9 Toward the end of the second week transverse segmentation of the paraxial mesoderm begins, and it is 2 19 show
GrayAnatomy 11 The yolk-sac (Figs. 22 and 23) is situated on the ventral aspect of the embryo; it is lined by entod 2 36 show
GrayAnatomy 10 The embryo increases rapidly in size, but the circumference of the embryonic disk, or line of meetin 2 39 show
GrayAnatomy 5 Fertilization consists in the union of the spermatozoön with the mature ovum (Fig. 8). Nothing is kn 2 43 show
GrayAnatomy 8 The notochord (Fig. 19) consists of a rod of cells situated on the ventral aspect of the neural tube 2 33 show
GrayAnatomy 7 In front of the primitive streak two longitudinal ridges, caused by a folding up of the ectoderm, ma 2 71 show
GrayAnatomy 15 —It is during this month that the first movements of the fetus are usually observed. The eruption of 2 38 show
GrayAnatomy 12 In reptiles, birds, and many mammals the allantois becomes expanded into a vesicle which projects in 2 460 show
GrayAnatomy 23 (Vertebræ Lumbales).The lumbar vertebræ (Figs. 92 and 93) are the largest segments of the movable pa 2 142 show
GrayAnatomy 19 (Columna Vertebralis; Spinal Column).The vertebral column is a flexuous and flexible column, formed 2 46 show