. An American text-book of obstetrics. For practitioners and students. Fig. 83. -Human ovum of about twelve days (Reichert): A, front view ; B, side view,to be limited in distribution, leaving the poles free. The villi are seen appearance of this ovum emphasizes the early and precocious development ofthe villi which encircle the flattened lenticular vesicle ( millimeters in itsgreatest diameter by millimeters in thickness) as a closely set equatorialzone. Of the embryo proper no trace was discoverable, a patch of thickenedcells alone representing the embryonal area. The earlier processe
. An American text-book of obstetrics. For practitioners and students. Fig. 83. -Human ovum of about twelve days (Reichert): A, front view ; B, side view,to be limited in distribution, leaving the poles free. The villi are seen appearance of this ovum emphasizes the early and precocious development ofthe villi which encircle the flattened lenticular vesicle ( millimeters in itsgreatest diameter by millimeters in thickness) as a closely set equatorialzone. Of the embryo proper no trace was discoverable, a patch of thickenedcells alone representing the embryonal area. The earlier processes of seg-mentation and blastulation have never been observed in the human of the Embryo.—The thirteenth and fourteenth days witness theevolution of the early embryonal form as effected by the development of themedullary groove and canal and their cephalic expansion. The embryo isattached by the allantoic stalk to the surrounding membranes, the axes of the PHYSIOLOGY OF PREGNANCY. 95 stalk and the upright embryo generally coinciding (Figs. 84, 85; see al
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectobstetrics, bookyear1
