Liver Segmentation

ANAT 305 - Cross Sectional Anatomy. University of Alberta

the classical description of the liver is based on …

it’s external appearance

what divides the liver into the right and left anatomic lobes

the falciform ligament

what divides the liver into it’s right and left functional lobes

the branches of the portal vein

in the anatomical description, the quadrate lobe belongs to the ____ lobe, while functionally it is part of the ____ lobe

right, left

the Couinaud classification of the liver anatomy divides the liver into how many functional segments

eight functional segments.

at the centre of each segment, there is a branch of what three things

1. portal vein

2. hepatic artery

3. bile duct

what is the vascular outflow in the periphery of each segment

It consists of branches of the hepatic veins that drain blood from the liver segments into the inferior vena cava.

to preserve the viability of the liver following surgery, resections follow the vessels defineing the which veins?

the hepatic veins

• the portal, bile duct, and hepatic arteriest are kept in tact

the right hepatic lobe divides the right lobe into ….

anterior and posterior segements

the middle hepatic vein divides the liber into ….

right and left lobes (hemiliver)

• this plane runs from the inferior vena cava to the gall bladder fossa

the left hepatic vein divides the left lobe into …

medial and lateral parts

the portal vein divides the liver into

upper and lower segments

• the left and right portal veins will branch superiorly and inferiorly into the center of each segment

on this illustratiom, it looks like the medial part of the left lobe is seperated from the lateral part by the falciform ligament. How is actually seperated?

the left hepatic vein seperates the medial part (segment 4) from the lateral part (segments 2 and 3)

what is the name of segment 1 of the liver

the caudate lobe is located posteriorly on the liver. It is considered part of the left lobe.

the left portal vein is at a _____ level to the right portal vein

more superior

the left portal vein divides the left lobe the liver into

superior segments: 2 and 4A

inferior segments: 3 and 4B

the right portal vein divides the right lobe of the liver into

superior segments: 7 and 8

Inferior segments: 5 and 6

are segments 6 and 7 visable anteriorly

No

What segments of the liver would be visable through a CT scan above the portal vein

segments 1, 2, 4A, 7, 8

What segments of the liver would be visable through a CT scan at the level of the RIGHT portal vein (inferior)

segments 1,3 , 4B, 5/6, 7/8

what segments of the liver would be visable through a CT scan at the level of the LEFT portal vein (superior)

segments 1, 2/3, 4A/B, 7,8

What segments of the liver would be visable through a CT scan at the level of the splenic vein?

segments: 3, 4b,5, 6

Each functionally independent segment is supplied by it’s own branch of _____ and _____, and drained by it’s own _____

own branch of portal vein and hepatic artery

drained by it’s own bile duct

What are the liver segments made easy on your hand