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The liver is grossly divided into two portions — a right and a left lobe, as viewed from the front diaphragmatic surface; but the underside the visceral surface shows it to be divided into four lobes and includes the caudate and quadrate lobes. The falciform ligamentvisible on the front of the liver, divides the liver into a left and a much larger right lobe.
From the underside, the two additional lobes are located between the right and left lobes. A line can be imagined running from the left of the vena cava and all the way forward to divide the liver and gallbladder into two halves. Other anatomical landmarks exist, such as the ligamentum venosum and the round ligament of the liver ligamentum tereswhich further divide the left side Lobe - Lobe the liver in two sections. An important anatomical landmark, the porta hepatisNatalia Kills - Perfectionist known as the transverse fissure of the liverdivides this left portion into four segments, which can be numbered starting at the caudate lobe as I in an anticlockwise manner.
From this parietal view, seven segments can be seen, because the eighth segment is only visible in the visceral view. The left lobe is smaller and more flattened than the right. It is situated in the epigastric and left hypochondriac regions. Its upper surface is slightly convex and is moulded on to the diaphragm; its under surface presents the gastric Lobe - Lobe and omental tuberosity.
The right lobe is much larger than the left; the proportion between them being as six to one. It occupies the right hypochondrium ; on its posterior surface by the Paranoia - Ion Javelin - Time To Change venosum for the cranial upper half, and by the ligamentum teres hepatis Round ligament of liver for the caudal under half. The ligamentum teres hepatis turns around the inferior marging of the liver to come out ventral in the falciform ligament.
The right lobe is functionally separated from the left lobe by the middle hepatic vein. A common misconception is that the falciform ligament separates the two lobes. However, from a functional perspective one that takes the arterial, portal venous, and systemic venous anatomy into account the falciform ligament separates the medial and lateral segments of the left hepatic lobe. The right lobe is of a somewhat quadrilateral form. These separate the right lobe in two smaller lobes on its left posterior part: the quadrate lobe and the caudate lobe.
The quadrate lobe is an area of the liver situated on the under surface of the medial segment Lobe - Lobe lobe Couinaud segment IVbbounded in front by the anterior margin of the liver ; behind by the porta hepatis ; on the right, by the Lobe - Lobe for the gall-bladder ; and on the left, by the fossa for the umbilical vein.
The caudate lobe posterior hepatic segment ISpigelian lobe is situated upon the postero-superior surface of the liver on the right lobe of the liver, opposite the tenth and eleventh thoracic vertebrae. The caudate lobe of the liver is bounded below, by the porta hepatis ; on the right, by the fossa for the inferior vena cava ; and, on the left, by the fossa for the ductus venosus and the physiological division of the liver called the ligamentum venosum.
It looks backward, being nearly vertical in position; it is longer from above downward than from side to side, and is somewhat concave in the transverse direction.
It is situated behind the portaand separates the fossa for the gall-bladder from the commencement of the fossa for the inferior vena cava. Budd—Chiari syndromecaused Lobe - Lobe occlusion of hepatic venous outflow, can lead to hypertrophy of the caudate lobe due to its own caval anastomosis that allows for continued function of this lobe of the liver.
The caudate lobe is named after the tail-shaped hepatic tissue Walking A Line (Radio Edit) - Various - Trance 2008 Volume 1 ; Latin, "tail" papillary process of the liver, which arise from its left side.
It also has a caudate process that is not tail-like shaped Lobe - Lobe from its right side which provides surface continuity between the caudate lobe and the visceral surface of the anatomical right lobe of the liver. This article incorporates text in the public domain from the 20th edition of Gray's Anatomy Lobe - Lobe From Wikipedia, the free encyclopedia. Lobes of liver The liver is divided into four lobes. This image shows the large right lobe and a smaller left lobe separated by the falciform ligament.
Retrieved In Busuttil, Ronald W. Transplantation of the Liver. Hepatology: Textbook and Atlas 3rd ed. Surg Clin North Am. Clinically Oriented Anatomy - 8th edition. Wolters Kluwer. Anatomy of the liver, pancreas and biliary tree. Anatomy portal.
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