258 



ANATOMY OF THE ORGANS. 



The chorioii is a connective-tissue layer covered on the side 

 toward the uterine wall with an epithelial layer. The con- 

 nective-tissue part shows originally the structure of embryonic 

 connective tissue i. e., stellate cells lying in a homogeneous 



FIG. 190. 



Placenta 

 uterina 



.* '<t ~i 



O.'i* Gland of 

 ""JI*^ " " uterus 



' 



">">" tf rill it N cut 



Placenta J 

 ffftalis] 



Proliferation 

 island 



litti'rrillinis 

 filled 

 irith Mood 



Transverse section through a human placenta at the second month of pregnancy. (After a 

 preparation by I'rof. Mars.) y 50. 



ground substance. Later it assumes the character of fibrous 

 connective tissue. The chorionic villi appear, during the first 

 months of their development, in the form of short protuber- 



