ADULT CIRCULATION. 443 



arteries. A rounded cord, which is the remnant of the 

 umbilical vein, forms the round ligament of the liver. A 

 slender cord, the remnant of the ductus venosus, is lodged 

 in a fissure of the liver, called the fissure of the ductus 

 venosus. 



A history of the development of the various tissues of 

 the body belongs really to general anatomy, and is usually 

 given in works specially devoted to that subject. We have 

 only treated of it incidentally, in our account of the develop- 

 ment of the various organs and systems. 



