OK 'I'll I- DIFFERENCES, ETC. 397 



after the cessation of this connection with the mother 

 and after respiration has taken place.* 



625. First, the umbilical vein, coming from the pla- 

 centa and penetrating the ring called umbilical, runs 

 to the liver, and pours its blood into the sinus of the 

 vena portae, the branches of which remarkable vein 

 distribute one portion through the liver, while the 

 ductus venosus ARANTII f conveys the rest directly to 

 the inferior vena cava. 



Both canals, the end of the umbilical vein contained 

 in the abdomen of the foetus, and the venous duct, 

 become closed after the division of the chord, and the 

 former is converted into the round ligament of the 

 liver. 



626. The blood, arriving at the right side of the heart 

 from the inferior cava, is in a great measure prevented 

 from passing through the lungs, and is derived into the 

 left or posterior auricle of the heart, by means of the 

 Eustachian valve and the foramen ovale. 



627. For, in the foetus, over the opening of the in- 

 ferior cava, there is extended a lunated valve, J termed, 

 from its discoverer, Eustachian, which usually dis- 



* Herm. Bernard, De eo quo differt circuitus sanguinis foetus ab illo hominis 

 nnti. Reprinted in Overkamp's collection. T. i. 



Jos. Wenc. Czikanek, De nctuosu hominis nascituri vita s. circulat. foetus 

 ab hominis nati diversitate. Reprinted in Wasserberg's collection. T. iv. 



Sabatier at the end of his Tr. Complet. d'Anat. Vol. iii. p. 386 sq. 1781 ; 

 and in the Memoires Mathemat. ft Physiques de I'Institut. T. iii. p. 337 sq. 



But especially J. Fr. Lobstein, Magasin Encyclopedique. 1803. T. iii. 

 Vol. li. p. 28 sq. 

 -f- Arant'ms, De humano ftetu libellus. p. 97. 



Compare B. S. Albinus, Explicatio tabular. Eustachii. p. 164 sq. 



* Haller, DC i-alvula Ei/stachii, Getting. 1738. 4to. 



Eustachius, De vcnu nn< jiri. p. 281). Opuscula. tab. viii. fig. 6. tab. x\-i. 

 fig. 3. 



