Asked by: Tabetha Haschenko
medical health digestive disorders

What is segment 4 of the liver?

Last Updated: 17th April, 2020

segment IV lies between the left and middle hepatic veins; it is subdivided into IVa (superior) and IVb (inferior) subsegments. easy tip: IVa is above and IVb is below the portal plane. segment IV includes the quadrate lobe.

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Accordingly, where is segment 4 of the liver?

The right border of the liver is formed by segment V and VIII. Although segment IV is part of the left hemiliver, it is situated more to the right. Couinaud divided the liver into a functional left and right liver by a main portal scissurae containing the middle hepatic vein.

Also Know, where is Segment 3 of the liver? Segments II and III lie lateral to the falciform ligament with II superior to the portal venous supply and III inferior. Segment IV lies medial to the falciform ligament and is subdivided into IVa (superior) and IVb (inferior)

Likewise, people ask, how many segments are in the human liver?

The liver is divided into three functional lobes: the right lobe, the left lobe, and the caudate lobe. The right and left lobes are further divided into 2 segments each: The anterior and posterior segments of the right lobe.

What segments are in the left lobe of the liver?

The left hepatic vein divides the left lobe into lateral (2, 3) and medial (4a, 4b) segments. The right hepatic vein divides the right lobe into anterior (5, 8) and posterior (6, 7) segments. The caudate lobe (1) has hepatic veins that often drain directly into the IVC.

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Where is Segment 5 of the liver?

segment V is located below the portal plane between the middle and right hepatic veins. segment VI is located below the portal plane to the right of the right hepatic vein. segment VII is located above the portal plane to the right of the right hepatic vein.

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What is segment 8 of the liver?

The liver is widely transected along the main hepatic fissure; then the pedicles of segment 8 are selectively ligated inside the parenchyma, and the resection is accomplished. This technique was used in 10 patients: 5 with hepatocellular carcinoma on cirrhosis and 5 with liver metastases.

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What liver segment is the gallbladder in?

In the right lobe, the main landmark is the right hepatic vein, which separates the right anterior segment (S5 and S8) from the posterior segment (S6 and S7). The gallbladder is located in the gallbladder fossa on the inferior surface of the liver between S4 and S5.

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Where is the right hepatic lobe located?

Right lobe
It occupies the right hypochondrium; on its posterior surface by the ligamentum venosum for the cranial (upper) half, and by the ligamentum teres hepatis (Round ligament of liver) for the caudal (under) half.

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What is the round ligament of the liver?

The round ligament of the liver (or ligamentum teres, or ligamentum teres hepatis) is the remnant of the umbilical vein that exists in the free edge of the falciform ligament of the liver. The round ligament divides the left part of the liver into medial and lateral sections.

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Where is the liver dome?

The term hepatic dome in general refers to the liver parenchyma close to the diaphragm and roughly accounts for nearly one-third of the liver volume.

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What is the right hepatic lobe?

The liver is divided into two lobes by the middle hepatic vein: the right lobe of liver and the left lobe of liver. The right lobe of liver is larger than the left lobe of liver. Each of these sections contains branches of the hepatic veins, portal veins, hepatic arteries, and bile ducts.

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Where is left lobe of liver?

When looking at the front of the liver, the left lobe of liver is divided from the right by the falciform ligament, which attaches the liver to the front wall of the body. The ligamentum venosum and ligamentum teres divide the left lobe of liver from the right as viewed from behind.

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How do you remember liver segments?

Couinaud classification of hepatic segments (mnemonic)
  1. segment I: (caudate): the thumb, in the palm of the hand.
  2. segment II: index finger proximal phalanx.
  3. segment III: index finger middle phalanx.
  4. segment IVa: middle finger proximal phalanx.
  5. segment IVb: middle finger middle phalanx.
  6. segment V: ring finger middle phalanx.
  7. segment VI: little finger middle phalanx.

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Where does the portal vein drain into?

The superior and inferior mesenteric veins join the splenic vein behind the pancreas to form the portal vein which carries blood to the liver, which in turn is drained by the hepatic veins which pass into the IVC.

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What is the portal triad?

portal triad (plural portal triads) (anatomy) A distinctive component of a hepatic lobule, found running along each of the lobule's corners, that consists of branches of the hepatic artery proper, hepatic portal vein and bile ducts, as well as other structures.

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How big is left lobe of liver?

Liver and gallbladder, anterior view. From a surgical point of view, the liver is divided into right and left lobes of almost equal (60:40) size by a major fissure (Cantlie's line) running from the gallbladder fossa in front to the IVC fossa behind.

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What does the right lobe of the liver do?

On the other hand, the functional right lobe of the liver processes blood coming from the head of the pancreas, the pylorus and antrum of the stomach, and the midgut via the superior mesenteric vein. The left medial segment receives blood from the entire gastrointestinal tract.

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What arteries supply the liver?

The liver is connected to two large blood vessels, the hepatic artery and the portal vein. The hepatic artery carries blood from the aorta to the liver, whereas the portal vein carries blood containing the digested nutrients from the entire gastrointestinal tract, and also from the spleen and pancreas to the liver.

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What is porta hepatis?

The porta hepatis is a deep fissure in the inferior surface of the liver through which all the neurovascular structures (except hepatic veins) and hepatic ducts enter or leave the liver 1. It contains: right and left hepatic ducts. right and left branches of hepatic artery.

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Should I be worried about liver lesions?

Benign Liver Lesions
They do not spread to other parts of the body, and typically do not pose a serious threat. However, if liver lesions cause pain, grow too large, are at risk of rupture, or cause internal bleeding, they may need to be surgically removed.

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How long does liver surgery take?

The length of your surgery will depend on how many tumors need to be treated. Most surgeries take between 2 and 4 hours, but some may take longer. Your doctor or nurse will tell you what to expect.

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What causes hypodense lesions in the liver?

Colon, lung, breast, and gastric cancers are the most common causes of hypovascular liver metastases. If the lesions do not show this appearance, small hypodense metastases may be difficult to differentiate from a host of benign hepatic lesions.