What are the different segments of the liver?

What are the different segments of the liver?

This table shows the relationship of hepatic sectors and hepatic segments. The four segments of left liver are: I (caudate); II (left lateral superior); III (left lateral inferior); and IV (left medial) [subdivided into superior (IVa) and inferior parts (IVb) by Bismuth].

What is Segment 3 of the liver?

segments 2 (II) and 3 (III) are to the left of the left hepatic vein and falciform ligament with II superior and III inferior to the portal plane. segment 4 (IV) lies between the left and middle hepatic veins; it is subdivided into 4a (IVa) (superior) and 4b (IVb) (inferior) subsegments.

How do you remember the segments of the liver?

The segments are represented by the following:

1. segment 1: (caudate): the thumb, in the palm of the hand.
2. segment 2: index finger proximal phalanx.
3. segment 3: index finger middle phalanx.
4. segment 4a: middle finger proximal phalanx.
5. segment 4b: middle finger middle phalanx.
6. segment 5: ring finger middle phalanx.

What is the function of the caudate lobe?

The caudate lobe (segment I) is the autonomous zone of the liver. It receives portal venous, as well as hepatic arterial, blood from both branches of the aforementioned vessels. Additionally, its biliary drainage is by both branches of the hepatic ducts and its venous return goes directly into the inferior vena cava.

Is the liver divided into segments?

The Couinaud classification divides the liver into 8 functional segments. The hepatic veins are found at the periphery of each segment, whereas the center has branches of the portal veins, hepatic arteries, and bile ducts. The middle hepatic vein divides the liver into left and right lobes.

How many segments are in the liver?

Based on Couinaud classification, the liver is divided into eight independent functional segments (Figs. 6 and 7). Each segment has its own portal pedicle consisting of the hepatic arterial branch, portal branch, and the bile duct with a sepa- rate hepatic venous branch that provides outflow (Fig.

What is segment 4 of the liver?

Segment IV is the medial segment of the left lobe. Segments II, III, and IV collectively make up the functional left lobe of the liver. The functional right lobe of the liver is made up of segments V and VIII, the anterior segments, and segments VI and VII, the posterior segments.

How many segments does the liver have?

Why is the liver divided into sections?

The division of the liver into independent units means that segments can be resected without damaging the remaining segments. To preserve the viability of the liver following surgery, resections follow the vessels defining the peripheries of each segment.

Why is the liver divided into segments?

Couinaud classification. The Couinaud classification of liver anatomy divides the liver into eight functionally indepedent segments. Each segment has its own vascular inflow, outflow and biliary drainage. In the centre of each segment there is a branch of the portal vein, hepatic artery and bile duct.

How is the liver divided into anatomical lobes?

Each lobe is divided into 2 sectors. The right hepatic vein (RHV) divides the right lobe into anterior and posterior sectors; the left hepatic vein (LHV) divides the left lobe into medial (quadrate) and lateral sectors.

The liver has two main portions, also called lobes. Each lobe is further divided into eight segments. Each segment has an estimated 1,000 lobules, also called small lobes. Each of the lobules has a small tube — a duct — that flows into other ducts that joins to become the common hepatic duct.

What are the sections of the liver?

The liver has two large sections, called the right and the left lobes. The gallbladder sits under the liver, along with parts of the pancreas and intestines. The liver and these organs work together to digest, absorb, and process food.

What are the stages of the liver?

Stage is the aount of scarring and the grade is the amount of inflamation, both are bad. 4 is the highest you can go for both. When you are at stage 4 you are considered to have cirrhosis of the liver, end stage liver disease. That is a little word that can mean all kinds of things.

What is the normal size of the right lobe of the liver?

Wide normal range: though usually 12-15cm. 10cm is considered on the smaller end but a lot of of it has to do with your body size and the way the measurement was taken. If the liver tissue itself was normal and your liver function tests are fine, no reason to worry.