RT Book, Section
A1 Harris, David A.
A1 Sheu, Eric G.
A2 Doherty, Gerard M.
SR Print(0)
ID 1171279421
T1 Biliary Tract
T2 Current Diagnosis & Treatment: Surgery, 15e
YR 2020
FD 2020
PB McGraw Hill LLC
PP New York, NY
SN 9781260122213
LK accesssurgery.mhmedical.com/content.aspx?aid=1171279421
RD 2024/04/18
AB The  anlage  of  the  biliary  ducts  and  liver  is  a  diverticulum  appearing  on  the  ventral  foregut  in  3  mm  embryos.  The  cranial  portion  becomes  the  liver;  a  caudal  bud,  the  ventral  pancreas;  and  an  intermediate  bud,  the  gallbladder.  The  hepatic  diverticulum  becomes  a  solid  mass  of  cells  that  later  recanalizes  to  form  ducts.  The  smallest,  the  bile  canaliculi,  first  appear  as  a  basal  network  between  the  primitive  hepatocytes  (Figure  27–1).  In  most  cases,  the  common  hepatic  duct  is  formed  by  the  union  of  a  single  right  and  left  duct.  In  25%  of  individuals,  the  anterior  and  posterior  divisions  of  the  right  duct  join  the  left  duct  separately.  The  origin  of  the  common  hepatic  duct  is  close  to  the  liver  but  always  outside  its  substance.  It  runs  4  cm  before  joining  the  cystic  duct  to  form  the  common  bile  duct.  The  common  duct  begins  in  the  hepatoduodenal  ligament,  passes  behind  the  first  portion  of  the  duodenum,  and  runs  in  a  groove  on  the  posterior  surface  of  the  pancreas  before  entering  the  duodenum.  Its  terminal  1  cm  is  intimately  adherent  to  the  duodenal  wall.  The  total  length  of  the  common  duct  is  about  9  cm.