Below the diaphragm are a number of potential spaces formed in relation to the attachments of the liver. One or more of these spaces may become ﬁlled with pus (a subphrenic abscess) walled off inferiorly by adhesions. There are ﬁve subdivisions of clinical importance.
The inferior mesenteric vein ascends above the point of origin of its artery to enter the splenic vein behind the pancreas.
The superior mesenteric vein joins the splenic vein behind the neck of the pancreas in the transpyloric plane to form the portal vein , which ascends behind the ﬁrst part of the duodenum into the anterior wall of the foramen of Winslow and thence to the porta hepatis.
Here the portal vein divides into right and left branches and breaks up into capillaries running between the lobules of the liver. These capillaries drain into the radicles of the hepatic vein through which they empty into the inferior vena cava.
In spaces between the lobules, termed portal canals, lie branches of the hepatic artery (bringing systemic blood) and the portal vein, both of which drain into the central vein by means of sinusoids traversing the lobule.
a conical or pear-shaped musculomembranous sac, lodged in a fossa on the under surface of the right lobe of the liver, and extending from near the right extremity of the porta to the anterior border of the organ
the organ is divided into fundus, body and neck, the latter opening into the cystic duct
The gall-bladder is supplied by the cystic artery (a branch usually of the right hepatic artery) which lies in the triangle made by the liver, the cystic duct and the common hepatic duct (Triangle of Calot)
lies retroperitoneally in roughly the transpyloric plane.
For descriptive purposes it is divided into head, neck, body and tail.
The head lies in the C-curve of the duodenum and sends out the uncinate process which hooks posteriorly to the superior mesenteric vessels as these travel from behind the pancreas into the root of the mesentery.