EXPERIMENTALLY PRODUCED EXTRAUTERINE PREGNANCY. 65 



cells. C are the giant cells surrounding the cuboidal cells. F is 

 fibrillary connective tissue in which there are many hemorrhages 

 h. There is nowhere a formation of a decidua . z; is a blood vessel. 



d — f-^ 











Fig. S- a typical placental structure. The various letters have the same sig- 

 nificance as in Fig. 4. 



As we have already seen on Fig. 4, the giant cells penetrate 

 deeper into the tissue, independently of the small cuboidal cells. 

 They prefer especially the neighborhood of blood vessels, pene- 

 trate the walls of the latter and replace the endothelial cells. 

 Blood vessels thus changed are of course thereby weakened, and 

 they are no longer as well able to resist to the full extent the blood 

 pressure, and thus hemorrhages into the tissue, as so frequently 

 seen, result. Fig. 6 shows two vessels v. Giant cells c have 

 advanced up to the lumen of these vessels and substitute the 

 endothelial cells. In c\ also there lies a giant cell in the tissue. 

 At many places there are hemorrhages h in the connective tissue. 

 In the periphery of the upper half of the section, connective 



