The lesser omentum (small omentum or gastrohepatic omentum) is the double layer of peritoneum that extends from the liver to the lesser curvature of the stomach, and to the first part of the duodenum
Duodenum
The duodenum is the first section of the small intestine in most higher vertebrates, including mammals, reptiles, and birds. In fish, the divisions of the small intestine are not as clear, and the terms anterior intestine or proximal intestine may be used instead of duodenum. In mammals the duodenum may be the principal site for iron absorption.
What attaches the liver to the peritoneum?
These are formed by a double layer of peritoneum. Falciform ligament – this sickle-shaped ligament attaches the anterior surface of the liver to the anterior abdominal wall and forms a natural anatomical division between the left and right lobs of the liver.
What attaches the liver to the lesser omentum?
Lesser omentum – Attaches the liver to the lesser curvature of the stomach and first part of the duodenum. It consists of the hepatoduodenal ligament (extends from the duodenum to the liver) and the hepatogastric ligament (extends from the stomach to the liver). The hepatoduodenal ligament surrounds the portal triad.
What is a peritoneal ligament?
Peritoneal Ligaments. A peritoneal ligament is a double fold of peritoneum that connects viscera together or connects viscera to the abdominal wall. An example is the hepatogastric ligament, a portion of the lesser omentum, which connects the liver to the stomach.
What is the membrane that lines the abdominal cavity?
The Peritoneum. The peritoneum is a continuous membrane which lines the abdominal cavity and covers the abdominal organs (abdominal viscera).
Which of the following structures connects the lesser curvature of the stomach and the proximal part of the duodenum to the liver?
(D) The lesser omentum connects the lesser curvature of the stomach and the proximal part of the duodenum to the liver (Moore, p 213).
What anchors the liver to the lesser curvature of the stomach?
The hepatogastric ligament connects the lesser curvature of the stomach to the visceral surface of the liver.
What extends between the stomach and liver?
The hepatogastric ligament extends between the liver and stomach. It consists of two layers that are continuous with the posterior leaf of the left triangular ligament and the right coronary ligament. They later go on to enclose the inferior vena cava.
Where does the lesser omentum attach to the liver?
The lesser omentum goes from the lesser curve here, to the underside of the liver, where its attachment is just out of sight. It's attached up here to the underside of the diaphragm. The lesser omentum extends down here onto the duodenum, where it has a free lower border as we'll see.
Where is the lesser omentum found quizlet?
Lesser Omentum - a fold of the peritoneum joining parts of the stomach and duodenum to the liver.
What is the parietal peritoneum?
Listen to pronunciation. (puh-RY-uh-tul PAYR-ih-toh-NEE-um) The layers of tissue that line the abdominal wall and the pelvic cavity.
Which peritoneal fold attaches the liver to the anterior internal body wall?
The falciform ligament is a thin anteroposterior double fold of peritoneum that represents an anterior portion of the mesentery connecting the liver to the posterior aspect of the anterior abdominal wall.
Which ligament attaches the liver to the anterior abdominal wall?
The falciform ligamentThe falciform ligament is the thin, sickle-shaped, fibrous structure that connects the anterior part of the liver to the ventral wall of the abdomen.
What three structures run in the free edge of the lesser omentum?
Between the two layers of the lesser omentum, close to the right free margin, are the hepatic artery proper, the common bile duct, the portal vein, lymphatics, and the hepatic plexus of nerves—all these structures being enclosed in a fibrous capsule (Glisson's capsule).
Which part of liver is related to lesser sac?
The lesser sac, also known as the omental bursa, is the cavity in the abdomen that is formed by the lesser and greater omentum. Usually found in mammals, it is connected with the greater sac via the omental foramen or Foramen of Winslow....Lesser sacLatinbursa omentalisTA98A10.1.02.402TA23703FMA198004 more rows
What is the function of the lesser omentum quizlet?
As discussed previously, the lesser omentum suspends the stomach and duodenum from the liver. It is a pathway for blood vessels entering the liver such as the hepatic portal vein and common hepatic artery. It also contains the common bile duct, lymph nodes and fat.
What is the lesser omentum function?
The lesser omentum connects the stomach and duodenum to the liver. It is the pathway for blood vessels entering the liver and contains the hepatic portal vein, common hepatic artery, and common bile duct, along with some lymph nodes.
How would you describe the lesser curvature of the stomach quizlet?
The lesser curvature of the stomach, extending between the cardiac and pyloric orifices, forms the right or posterior border of the stomach. The part of the alimentary canal that connects the throat to the stomach; the gullet. In humans and other vertebrates it is a muscular tube lined with mucous membrane.
Which of the following attaches the liver to the anterior abdominal wall?
The falciform ligament is the thin, sickle-shaped, fibrous structure that connects the anterior part of the liver to the ventral wall of the abdomen.
What is Gastrohepatic ligament?
The gastrohepatic ligament is part of the lesser omentum. It joins the gastro-oesophageal junction and lesser curvature of the stomach to the liver at the fissure of the ligamentum venosum superiorly and the porta hepatis inferiorly.
Which muscle S are responsible for pushing the bolus towards the esophagus?
Receptors in the posterior pharynx are then activated to initiate the involuntary phase of deglutition, which involves carefully sequenced contraction of numerous head and neck muscles. The food bolus is rapidly pushed toward the esophagus by the pharyngeal constrictor muscles.
What are the two layers of the peritoneum?
The peritoneum consists of two layers that are continuous with each other: the parietal peritoneum and the visceral peritoneum. Both types are made up of simple squamous epithelial cells called mesothelium.
Which membrane covers the abdominal cavity?
The peritoneum is a continuous membrane which lines the abdominal cavity and covers the abdominal organs (abdominal viscera).
How are the abdominal viscera divided?
The abdominal viscera can be divided anatomically by their relationship to the peritoneum. There are two main groups: intraperitoneal and retroperitoneal organs.
What is the visceral peritoneum?
The visceral peritoneum invaginates to cover the majority of the abdominal viscera. It is derived from splanchnic mesoderm in the embryo.
Where does the parietal peritoneum originate?
The parietal peritoneum lines the internal surface of the abdominopelvic wall. It is derived from somatic mesoderm in the embryo. It receives the same somatic nerve supply as the region of the abdominal wall that it lines; therefore, pain from the parietal peritoneum is well localised.
Which part of the body covers the viscera?
The peritoneum covers nearly all viscera within the gut and conveys neurovascular structures from the body wall to intraperitoneal viscera.
Why is the abdominal policeman called the policeman?
It has a role in immunity and is sometimes referred to as the ‘ abdominal policeman ’ because it can migrate to infected viscera or to the site of surgical disturbance.
Where is the pouch like extension of the visceral peritoneum from the lower edge of the stomach part of?
Pouch like extension of the visceral peritoneum from the lower edge of the stomach part of the duodenum and the transverse colon
What chapter is the peritoneal cavity?
Chapter 17 The Peritoneal Cavity and Abdominal Wall
Where are the loops of the digestive tract anchored?
Loops of the digestive tract are anchored to the posterior wall of the abdominal cavity by this large double fold of peritoneal tissue
Where are the most dependent areas in the abdomen and pelvis?
Most dependent areas in the flanks of the abdomen and pelvis where fluid collections may accumulate
Which plexus innervates the parenchyma of the liver?
The parenchyma of the liver is innervated by the hepatic plexus, which contains sympathetic (coeliac plexus) and parasympathetic (vagus nerve) nerve fibres. These fibres enter the liver at the porta hepatis and follow the course of branches of the hepatic artery and portal vein.
Which ligament attaches the anterior surface of the liver to the anterior abdominal wall?
Falciform ligament – this sickle-shaped ligament attaches the anterior surface of the liver to the anterior abdominal wall and forms a natural anatomical division between the left and right lobes of the liver. The free edge of this ligament contains the ligamentum teres, a remnant of the umbilical vein.
How does hepatic drainage work?
Venous drainage of the liver is achieved through hepatic veins. The central veins of the hepatic lobule form collecting veins which then combine to form multiple hepatic veins. These hepatic veins then open into the inferior vena cava.
What are the two surfaces of the liver?
There are two liver surfaces – the diaphragmatic and visceral: Diaphragmatic surface – the anterosuperior surface of the liver. It is smooth and convex, fitting snugly beneath the curvature of the diaphragm.
What is the liver covered by?
Macroscopic. The liver is covered by a fibrous layer, known as Glisson's capsule. It is divided into a right lobe and left lobe by the attachment of the falciform ligament. There are two further 'accessory' lobes that arise from the right lobe, and are located on the visceral surface of liver:
What is the lobe of the liver?
Macroscopic. The liver is covered by a fibrous layer, known as Glisson’s capsule. It is divided into a right lobe and left lobe by the attachment of the falciform ligament. There are two further ‘accessory’ lobes that arise from the right lobe, and are located on the visceral surface of liver:
What is the function of the liver?
An accessory digestion gland, the liver performs a wide range of functions, such as synthesis of bile, glycogen storage and clotting factor production.
Overview
The lesser omentum (small omentum or gastrohepatic omentum) is the double layer of peritoneum that extends from the liver to the lesser curvature of the stomach, and to the first part of the duodenum. The lesser omentum is usually divided into these two connecting parts: the hepatogastric ligament, and the hepatoduodenal ligament.
Structure
The lesser omentum is extremely thin, and is continuous with the two layers of peritoneum which cover respectively the antero-superior and postero-inferior surfaces of the stomach and first part of the duodenum.
When these two layers reach the lesser curvature of the stomach and the upper border of the duodenum, they join together and ascend as a double fold to the porta hepatis.
Divisions
Anatomically, the lesser omentum is divided into ligaments, each starting with the prefix "hepato" to indicate that it connects to the liver at one end.
Most sources divide it into two parts:
• hepatogastric ligament: the portion connecting to the lesser curvature of the stomach
• hepatoduodenal ligament: the portion connecting to the duodenum
Contents
Between the two layers of the lesser omentum, close to the right free margin, are the hepatic artery proper, the common bile duct, the portal vein, lymphatics, and the hepatic plexus of nerves—all these structures being enclosed in a fibrous capsule (Glisson's capsule).
Between the layers of the lesser omentum, where they are attached to the stomach, run the right and left gastric arteries, as well as the gastric veins.
Additional images
• Diagrams to illustrate the development of the greater omentum and transverse mesocolon.
• Horizontal disposition of the peritoneum in the upper part of the abdomen.
See also
• Peritoneum – Serous membrane that forms lining of abdominal cavity or coelom
• Greater omentum – Fat sheath under abdominal wall
External links
• Weiglein, Andreas H. (1996). "Variations and topography of the arteries in the lesser omentum in humans". Clinical Anatomy. 9 (3): 143–150. doi:10.1002/(SICI)1098-2353(1996)9:3<143::AID-CA1>3.0.CO;2-H. PMID 8740472.
• Dux, K. (1990). "Anatomy of the greater and lesser omentum in the mouse with some physiological implications". The Omentum. pp. 19–43. doi:10.1007/978-1-4612-3436-4_3. ISBN 978-1-4612-8011-8.