27.23
Gross Anatomy of the Liver
The liver, the largest gland within the human body, is a firm and reddish-brown organ. This wedge-shaped structure weighs approximately 1.5 kg and occ…
The liver is the largest gland in the body, weighing approximately 1.4 kg in adults.
It is wedge-shaped and located more in the right hypochondriac and epigastric regions, spanning the midline into the left hypochondriac region.
Positioned under the diaphragm, the liver is mostly shielded by the rib cage and is covered by the visceral peritoneum, except for a small bare area that touches the diaphragm.
The liver has four main lobes: the right, left, caudate, and quadrate lobes.
The falciform ligament, a mesentery, divides the right and left lobes anteriorly and suspends the liver from the diaphragm and anterior abdominal wall.
The round ligament, a fibrous remnant of the fetal umbilical vein, runs along the inferior edge of the falciform ligament.
The lesser omentum anchors the liver to the lesser curvature of the stomach.
Blood vessels reach the liver by traveling through the lesser omentum's connective tissue, converging at the porta hepatis.
The gallbladder is located in a recess on the inferior surface of the right liver lobe.
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Q1: Where is the liver located in the body?
The liver is positioned under the diaphragm, primarily in the right hypochondriac and epigastric regions, extending across the midline into the left hypochondriac region. Almost entirely protected by the rib cage, the liver is the largest gland in the body, weighing approximately 1.4 to 1.5 kg in adults. Its wedge shape and superior position make it well-shielded from external trauma.
Q2: What are the four main lobes of the liver?
The liver comprises four main lobes: the right lobe, left lobe, caudate lobe, and quadrate lobe. The falciform ligament divides the right and left lobes anteriorly. The caudate lobe is smaller and located posteriorly, while the quadrate lobe sits between the left lobe and the gallbladder on the inferior surface.
Q3: What is the falciform ligament and what does it do?
The falciform ligament is a mesentery that divides the right and left lobes of the liver anteriorly and suspends the organ from the diaphragm and anterior abdominal wall. The round ligament, a fibrous remnant of the fetal umbilical vein, runs along its inferior edge, marking an important anatomical landmark on the liver's surface.
Q4: How is the liver covered and protected?
The liver is covered by a robust fibrous capsule and a layer of visceral peritoneum, except for a small bare area on its superior surface that contacts the diaphragm directly. This peritoneal covering, combined with the protection of the rib cage, shields the liver from injury while allowing it to move slightly with respiration.
Q5: What structures anchor the liver to surrounding organs?
The lesser omentum anchors the liver to the lesser curvature of the stomach, while the falciform ligament suspends it from the diaphragm and anterior abdominal wall. Blood vessels and other structures reach the liver through the connective tissue of the lesser omentum, converging at the porta hepatis, a critical region for hepatic blood supply to the digestive system.
Q6: Where is the gallbladder positioned relative to the liver?
The gallbladder is located in a recess on the inferior surface of the right liver lobe. The quadrate lobe, situated between the left lobe and the gallbladder, helps define the gallbladder's anatomical position. This arrangement allows the gallbladder to store bile produced by the liver for use in digestion.
Q7: What does the round ligament represent anatomically?
The round ligament is a fibrous remnant of the fetal umbilical vein that runs along the inferior edge of the falciform ligament. This structure serves as an important anatomical landmark on the liver's anterior surface and represents a vestigial remnant from fetal circulation that becomes non-functional after birth.