File:Bryce1908 plate05.jpg

Plate 5. Section of a Portion of the Wall of the Blastocyst

Fig. 5. Section of a Portion of the Wall of the Blastocyst, showing cvto-trophoblaat and plasmodi-trophoblast, with portions of decidua, and the opening of an enlarged sinuslike capillary into the implantation cavity. x 350 D.

cyt., cyto-trophoblast ; dec, decidua ; end., endothelium of maternal capillary ; pL, plasmodiuni ; n.z., necrotic zone of decidua.

The cytological characters of cyto- and plamodi-trophoblast are here brought out. The section passes through an opening, eroded by the plasmodiuni, in the wall of a large sinus-like capillary. The endothelium is still ijartly preserved, and covers the upper portion of decidua. The vessel opens by a wide gap into the implantation cavity, and the opening is partially occupied by a large mass of irregular vacuolated plasmodium. This is continuous with the necrotic zone of the decidua, from which it is distinguislied by a difference in colour. The plasmodium is not continuous with the other poition of decidua ; between them there is a narrow space containing a few leucocytes. Under the endothelium there are several large apparently degenerated decidual cells. The guiding line to the endothelium touches one of these cells.

Bryce 1908 Human Ovum: Plate 1 | Plate 2 | Plate 3 | Plate 4 | Plate 5 | Plate 6 | Plate 7 | Plate 8 | Plate 9 | Plate 10

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