How do you identify liver segments on a CT scan?
Segment 5 to 8 make up the right hemiliver and are easier to describe:
- segment 5 (V) is located below the portal plane between the middle and right hepatic veins.
- segment 6 (VI) is located below the portal plane to the right of the right hepatic vein.
What are the 8 segments of the liver?
Liver surgery
- Right hepatectomy. segment V, VI, VII and VIII (± segment I).
- Extended Right or right trisectionectomy. segment IV, V, VI, VII and VIII (± segment I).
- Left hepatectomy. segment II, III and IV (± segment I).
- Extended Left or left trisectionectomy. segment II, III, IV, V and VIII (± segment I).
What are the 4 segments of the liver?
The four lobes are the right lobe, the left lobe, the caudate lobe, and the quadrate lobe. Seen from the front – the diaphragmatic surface – the liver is divided into two lobes: the right lobe and the left lobe.
What is segment VI of the liver?
segment 6 (VI) is located below the portal plane to the right of the right hepatic vein. segment 7 (VII) is located above the portal plane to the right of the right hepatic vein. segment 8 (VIII) is located above the portal plane between the middle and right hepatic veins.
How are the liver segments divided?
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 liver segments are there?
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 segments are in the right 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. Segment I, the caudate lobe, is located posteriorly. The outflow of the liver is provided by the three hepatic veins.
How many segments are in the liver?
The liver has eight segments, which are referred to by numbers or by names. The numbering of the segments is done in a counterclockwise manner with the liver being viewed from the inferior surface, starting from Segment I (the caudate lobe).
How are liver segments divided?
Where is segment 4 in the liver?
left lobe
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.
What is segment 1 of the liver?
Segment I is the caudate lobe and is situated posterior l. It may receive its supply from both the right and the left branches of portal vein. It contains one or more hepatic veins which drain directly into the inferior vena cava (IVC).
How do you remember liver segments?
Couinaud classification of hepatic segments (mnemonic)
- segment 1: (caudate): the thumb, in the palm of the hand.
- segment 2: index finger proximal phalanx.
- segment 3: index finger middle phalanx.
- segment 4a: middle finger proximal phalanx.
- segment 4b: middle finger middle phalanx.
- segment 5: ring finger middle phalanx.
