. A study of the causes underlying the origin of human monsters : third contribution to the study of the pathology of human embryos . Fig, 276b.—Interior of the ovum, showing broken embryo on one side of it. Natural size. 268 MALL. [Vol. XIX. they are invaded at numerous points by the syncytium, whichforms in them small vesicles, lined with two layers of cells,and often filled with dense masses of small round cells. Thesevesicles are very numerous and usually communicate with the. Fig. 276c.—Section of the embryo. X 8j4 times. surface of the villi by means of bands of epithelial cells. Thewall
. A study of the causes underlying the origin of human monsters : third contribution to the study of the pathology of human embryos . Fig, 276b.—Interior of the ovum, showing broken embryo on one side of it. Natural size. 268 MALL. [Vol. XIX. they are invaded at numerous points by the syncytium, whichforms in them small vesicles, lined with two layers of cells,and often filled with dense masses of small round cells. Thesevesicles are very numerous and usually communicate with the. Fig. 276c.—Section of the embryo. X 8j4 times. surface of the villi by means of bands of epithelial cells. Thewalls of the chorion are in apposition to those of the amnion,but they are not invaded by syncytium. The changes within the embryo are equally spinal cord is dilated and dissociated; the medulla is No. i.] ORIGIN OF HUMAN MONSTERS. 269 solid, fills the entire head and protrudes from an openingformed by the destruction of the forepart of the head. Infront of this opening the atrophic upper jaw may be seen,containing nerves, and behind the epidermis has grown intoa small ridge, encircling the opening. What has taken placein this embryo took place mechanically in No. 256 (see PlateIII). The outlines of the organs are not sharp, but those ofthe precartilages are very definite. The blood-vessels aregreatly dilated and filled with blood cells, which make themlook like abscesses. They are especially well marked alongthe line from the umbilical cord to the heart. In t
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