M/,', LW8 i\\/:\/./' V" '//// \i;i'i>Mi\\i. DIGESTIVE CANAL. ^:> 



with the principal pancreatic duct. The orifices of these two canals 

 are surrounded by a circular iniicous 1'old (<////y<////</ <>/' ]'<//</), which is 

 usually very prominent, and acts as a valve in preventing the entrance of 

 alimentary substances into the apertures it encircles ; this oflice it fills eo 

 well, that it will not even allow the air with which the duodenum is inflated 

 to pass into the ducts. 



Fig. 216. 



l.\. ICI.TOUV Al'IAKAll- "I Till-: IIOKSI.'S I.IVI.I:. 



1. Left lobe of the liver; >, Middle lobe; .'?, Right lobe; 4, Lobule f S].i'_'.-l : '. 

 ii>r vena rava at its entrance iuto the liver: 7, Vena i>ort:r; S, Ihirtu* 

 <:holedochus ; 9, Pancreatic duct ; 10, Common entrance of these two ducts into 

 the small intestine. 



There enter into the structure of the ductus choledochus : 1, A fibrous 

 . which some anatomists believe contains unstriped muscular 

 fibres: '2. Cylindrical ^/'//i/7////// ; 3, Numerous racemose glaruh, opening on its 

 inner surface by very small orifices. 



VESSELS AND NERVES OF THE LIVER. The /./.</ veateU are the hepatic 



, portal vein, and supnihepatic veins. 



The li> ii/!<- <n-t> i- if is a branch of the coeliac, and enters the gland by the 



: ior ti>smv. iu company with the. portal vein and ductus choledochus. 



In the liver it divides into very fine ramifications which join the intra- 



lobnlar jilcxus, anastomose on the surface of the biliary ducts, or expand 



either on the serous membrane, or in the walls of the portal vein. 



The jx.rtnl ri-'ni is the functional vessel of the liver. It reaches that 

 or^in by the posterior ti-sure, and (Jlisson's capsule accompanies its rami- 

 fications as far as the hepatic lobules, where they form the plexus of sub- 

 hepatic veins. 



.-nj.rnli'-jxiiti- ior xiililalmliu- 1 rrinx arc so named bccuiiM- they gaiu 

 tin iintero-8UjX5rior face of the viscus to open into the posterior vein cava. 

 They carry away the blood that has been brought by the port.-il vein and 

 hepatic artery. Their origin is due to the union of the intnilobular \ 

 which make a passage through the hepatic ti^ue with \\hi<-h tht ir wall 

 immediately in contact, gradually join each other, and enter tlii- posterior 

 on it< way through the anterior fissure of the liver. The number 

 f trunks ( lff,iiti<-) entering this vessel is considerable, but the majority are 

 ,-niall ; the principal confluent is placed at the anterior extremity of 

 



The /<///jy/A->//'.> form a line stii>eificial plexus, easy to inject , with deeper 



