File:HamiltonBoyd1960 plate04.jpg

Plate 4

Fig. 9. Photograph ( x 200) of a section through the deep central portion of the implantation site of the Barnes embryo; maternal tissue is on the right of the illustration. The intereommunicating lacunar spaces (L.S.) are shown surrounded by syncytial trophoblast. Uterine venous sinusoids (S.) communicate with these. A plug of syncytium can be seen in direct contact with the lumen of the uterine gland (G.).

Fig. 10. Photomicrograph (x 840) of a section through the primitive syncytium and adjacent oedematous endometrium in the Barnes embryo; maternal tissue is on the left of the illustration. Note the texture of the syncytial cytoplasm, a long stretch of which is devoid of nuclei. In the upper part of the figure there is an irregular projection of syncytium, containing a very large nucleus, into the endometrium; elsewhere the foetal-maternal junction is smooth.

Fig. 11. Photomicrograph ( x 636) of the foetal-maternal junction of the Barnes embryo. A mass of primitive syncytium is in direct contact with the lumen of a uterine gland (G.) in which secretion can be seen. The syncytium separates this lumen from a lacunar space (L.S.).

Fig. 12. Photomicrograph ( x 840) to show an opening of a venous sinusoid (S.) into a lacunar space (L.S.). Note the relations of the endothelium of the sinusoid to the syncytium.