Chap. IV.] 



LIVER OF MAMMALS. 



173 



outgrowth becomes bilobed, while in the rabbit two 

 diverticula are developed, but not simultaneously. 



The fat formed in the liver is, in many Fishes, fluid ; 

 or, in other words, oil ; in these animals the organ is 

 often of large size in proportion to the rest of the 



Fig. 78. Diagramatic View of the Inferior or Visceral Surface pf a 

 Multilobed Liver of a Mammal extended transversely. 



ir, Inferior vena cava; p, vena portse; it, umbilical vein of the foetus, represented 

 by the round ligament in the adult, lying in the umbilical fissure; II, left 

 lateral lobe ; Ic, left central lobe ; re, right central lobe ; rl. right lateral lobe ; 

 s. spigelian lobe : c, caudate lobe ; g, gall bladder ; di\ remnant of ductus 

 venosus : llf, left lateral fissure ; cf, central fissure ; rlf, right lateral fissure. 

 (After Flower.) 



intestines, and much less firm in its consistency than 

 in the higher divisions of the Vertebrata. 



With regard to the liver of Mammals (Fig. 78), 

 various attempts have been made to form a satisfactory 

 system of nomenclature for its lobes, but it remained 

 for Flower to suggest one which should gain universal 

 acceptance. 



We are taught by embryology that the liver 

 ordinarily arises by two lateral outgrowths from the 

 intestine, so that it is primitively bilobed ; in the 

 young (foetus) the umbilical vein divides the liver 



