What are the different segments of the liver?
Contents
- 1.1 Caudate lobe.
- 1.2 Left lobe.
- 1.3 Right lobe.
- 1.4 Quadrate lobe.
How liver is divided into 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. The left hepatic vein divides the left lobe into lateral (2, 3) and medial (4a, 4b) segments.
How do you remember liver segments?
The segments are represented by the following:
- 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.
What is segment 7 in the liver?
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.
Where is Segment 2 and 3 of the liver?
Until now, conventional consideration was that S2 was the superior-posterior part and S3 was the inferior-anterior part of the lateral segment of the left hepatic lobe (to the left of the falciform ligament, containing S2 and S3, which will be abbreviated as left lateral segment).
What are lobes of liver?
Anatomically the liver has four lobes: right, left, caudate, and quadrate.
What is Segment 5 of the liver?
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. segment 7 (VII) is located above the portal plane to the right of the right hepatic vein.
What is HCC?
Hepatocellular carcinoma (HCC) is the most common type of primary liver cancer. Hepatocellular carcinoma occurs most often in people with chronic liver diseases, such as cirrhosis caused by hepatitis B or hepatitis C infection.
What is segment 6 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.
Which is the largest lobe of liver?
The left and right lobes are the largest lobes and are separated by the falciform ligament. The right lobe is about 5 to 6 times larger than the tapered left lobe. The small caudate lobe extends from the posterior side of the right lobe and wraps around the inferior vena cava.
What are the 3 lobes of the liver?
Usually they are located just on the inside of the abdominal wall. Liver–The largest structure of the the body cavity. This brown colored organ is composed of three parts, or lobes. The right lobe, the left anterior lobe, and the left posterior lobe.
What is metastatic HCC?
Hepatocellular carcinoma (HCC) is one of the most common cancers worldwide, with the highest incidence in regions with high prevalence of chronic viral hepatitis infection, especially hepatitis B infection. HCC commonly metastasises to lungs, lymph nodes, adrenal gland and bones, including the skull.
What is a Hepatosarcoma?
Sarcomas are rare malignant tumors arising from mesenchymal cells exhibiting heterogeneous histological patterns. In the liver, these tumors represent only 0.1% to 2% of primary hepatic cancer. 1,2. In most patients, causative factors remain unclear. Primary symptoms are nonspecific.
What is the unit of liver?
lobule
The functional unit of the liver is the lobule. Each lobule is hexagonal and a portal triad (portal vein, hepatic artery, bile duct) sits at each corner of the hexagon. The foundation of the lobule is composed of hepatocytes, which have physiologically distinct apical and basolateral membranes.
How many segments are there in the liver?
Couinaud (1957) divided the liver into eight functionally indepedent segments. 3. • Couinaud classification – 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, and bile duct.
What are the lobes of the liver?
LOBES OF THE LIVER Anatomical Lobes: On the diaphragmatic surface: the liver is divided into two lobes, right and left, by the attachment of the falciform ligament. The right lobe which forms the base of the wedge-shaped liver is approximately six times larger than the left lobe.
What are the two types of liver anatomy?
• Liver anatomy can be described using two different aspects: morphological anatomy and functional anatomy. • The traditional morphological anatomy is based on the external appearance of the liver and does not show the internal features of vessels and biliary ducts branching, which are of obvious importance in hepatic surgery.
What are the external features of the liver?
EXTERNAL FEATURES The wedge-shaped liver presents: Two well-defined surfaces: diaphragmatic and visceral. One well-defined border: inferior border.