THE INTERNAL ORGANS OF REPRODUCTION 421 



and presents at the superior angles the openings of 

 the Fallopian tubes; also, at its junction with the 

 neck it is constricted to form the os internum. The 

 cavity of the cervix is barrel-shaped and flattened 

 anteroposteriorly, presenting on each wall a longi- 

 tudinal column sending off oblique rugse on each side; 

 hence its name, arbor vitse uterinus. 



TUBAL VESSELS 



FlG. 147 



ANASTOMOSIS OF 



UTERINE AND 

 OVARIAN ARTER 

 tS \ 



ES 



VAGINAL VENOUS PLEXUS 



1*URETER 



|\ : m SUPERIOR VAGINAL 



ARTERIES 



OS UTERI VAGINA CUT OPEN BEHIND 



Vessels of the uterus and its appendages, rear view. (Testut.) 



The walls of the uterus consist of an outer serous 

 coat, an inner mucous, and an intermediate muscular. 

 The muscular coat forms the bulk of the uterus, 

 and consists of bundles and layers of unstriped fibers 

 which interlace, and of some areolar tissue sup- 

 porting them, and of bloodvessels, lymphatics and 

 nerves. 



The mucous membrane of the body differs from that 

 of the cervix. The former is smooth, reddish, with 

 columnar cells, and presents the ducts of a number of 

 tubular glands which end by blind, sometimes forked, 

 extremities. In the cervix it is firmer, and presents 



