THE REPRODUCTIVE ORGANS. 



229 



mucus serving to close the cervical canal during pregnancy. The 

 orifices of these glands sometimes become occluded, causing a cystic 

 dilatation of the acini, due to accumulated secretion, " ovula Nabothi." 



Fig. 206. 



Placenta 

 uterina 





■•;•'•-• */< - .".' •'^V.'V.-.. ••'••.. : -. ■:'■''; ,-./.•• • :/ '' -"'5" ,v-.'.'\'«i Glandof 

 : .'^■•v'.'v.'*"- -'••'•; i .. '.*'." ..-.v's- ■•- ' -V.'-*H 



r 



(J Epithelium 

 villus cut 

 tangentially 



i 







\ - ■ 



V2 i^**-— -;v'- -.-; 



__N I Proliferation 



1 ,~i island 



Placenta j 

 foetalis* 





x J ,, ;y 





"'■-. 



-' 



t : - Vi ■ 



Intervillous 

 spaces filled 

 with mater- 

 nal blood 



^-Villus 



^.: \ 



V \ 



x< 



A 



Membrana 

 chorii 



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

 (Alter a preparation by Prof. Mars.) (X 50.) 



The muscular and other tissues of the uterine wall undergo 

 hypertrophy during pregnancy, the individual muscular fibres be- 

 coming as much as thirty times their original bulk in the non-preg- 



