The lesser sac or omental bursa is a potential peritoneal space within abdomen, part of the peritoneal cavity. It may be conceptualized as the space posterior to the lesser omentum, between the posterior wall of the stomach and surface of peritoneum which covers the anterior surface of the left kidney.1.
Full Answer
What are the boundaries of the lesser sac?
As the lesser sac is a peritoneal space, all of its boundaries are lined by visceral or parietal peritoneum. visceral/parietal peritoneum that covers the diaphragm, pancreas, left kidney/adrenal gland, and duodenum transverse mesocolon (between the transverse colon and anterior surface of the pancreas)
What is lesser sac of stomach?
Lesser sac. Simultaneously, the lesser curvature of the stomach rotates posteromedially, and the ventral peritoneal ligament between stomach and liver becomes the lesser omentum, an incomplete boundary separating the main peritoneal cavity (greater sac) from the posterior recess (lesser sac).
What structures does the pancreas have direct anatomical relations to?
Within the abdomen, the pancreas has direct anatomical relations to several structures Stomach – Separated from the pancreas by the lesser sac, the stomach and pylorus lie anterior and to the pancreas. Duodenum – The “C” shaped duodenum curves around and outlines the head of the pancreas.
Where is the greater sac located in the body?
The greater sac extends from the diaphragm to the pelvic cavity. It is divided into the supracolic and infracolic compartments by the transverse mesocolon. The supracolic compartment is found anterior and superior to the transverse mesocolon, and contains the liver, stomach and spleen.
What is located in the 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 are the Greater and Lesser sacs?
In human anatomy, the greater sac, also known as the general cavity (of the abdomen) or peritoneum of the peritoneal cavity proper, is the cavity in the abdomen that is inside the peritoneum but outside the lesser sac. The greater sac or general cavity (red) and lesser sac, or omental bursa (blue).
What is the function of the lesser sac?
The omental bursa, also called the lesser sac, is located posteriorly to the stomach and the lesser omentum (which will be discussed later), and anteriorly to the pancreas and duodenum. The function of the omental bursa is to allow unrestricted movement of the stomach.
Is the pancreas in the omental bursa?
The omental bursa (lesser peritoneal sac) lies between the peritoneal coverings of the stomach (anterior) and the pancreas (posterior). The transverse colon crosses anterior to the descending duodenum and the head of the pancreas.
What does greater sac contain?
Greater sac The supracolic compartment is found anterior and superior to the transverse mesocolon, and contains the liver, stomach and spleen.
What is the sac that holds your organs?
Your peritoneum is a membrane that lines the inside of your abdomen and pelvis (parietal layer). It also covers many of your organs inside (visceral layer). The space in between these layers is called your peritoneal cavity.
What happens when you have your omentum removed?
An omentectomy may cause fluid retention due to blocked lymphatic blood vessels. You may have difficulty using the bathroom, both urinating and passing stool, during this period. As with any type of surgery, there's also the risk for an infection, bleeding or nerve damage.
How is the lesser sac formed?
As the greater curvature of the stomach rotates anterolaterally, a recess is formed between the redundant dorsal peritoneal ligament connecting the greater curvature of the stomach to the dorsal abdominal wall.
What potential space separates the pancreas from the stomach?
The pancreas lies in the anterior pararenal space. This space is a natural pathway as it connects with the base of several mesenteries. The tail of the pancreas lies in the splenic hilum so disease can spread along the gastrosplenic ligament to the gastrocolic ligament along the greater curvature of the stomach.
Where does pancreas located?
Your pancreas sits behind your stomach and in front of your spine. Your gallbladder, liver and spleen surround your pancreas. The right side of your body contains the head of your pancreas. This narrow organ lies along the first segment of your small intestine, called the duodenum.
What is greater omentum and lesser omentum?
It extends from the greater curvature of the stomach, passing in front of the small intestines and doubles back to ascend to the transverse colon before reaching to the posterior abdominal wall. The greater omentum is larger than the lesser omentum, which hangs down from the liver to the lesser curvature.
What is contained in the omental bursa?
The omental bursa includes a main cavity (situated posteriorly to the stomach) and three recesses: the superior omental recess (between the caudate lobe of the liver and the front part of the diaphragm), the inferior omental recess (lying between the anterior and posterior layers of the greater omentum) and the lienal ...
What is the lesser sac of the peritoneum?
The lesser sac is bounded superi- orly by the peritoneum covering the caudate lobe of the liver and laterally on the left side by the gastrosplenic and splenorenal liga- ments [9]. The right medial side of the omen- tal bursa is continuous with the greater sac through the epiploic foramen.
What is Morison's pouch?
Morison's pouch is an area between your liver and your right kidney. It's also called the hepatorenal recess or right subhepatic space. Morison's pouch is a potential space that can open up when fluid or blood enters the area. When these aren't present, there's no space between your liver and right kidney.
What is Douglas pouch?
The pouch of Douglas (cul-de-sac) represents the caudal extension of the peritoneal cavity. It is the rectovaginal pouch in the female and the rectovesical pouch in the male. The cul-de-sac is in a dependent position when either upright or supine; it is, therefore, a frequent location for seeded lesions.
What is the difference between the peritoneum and the omentum?
Peritoneum is a serous membrane lining the abdominal cavity. Omentum is a fold of the peritoneal layer. It may be two-layered or four-layered with patches that give it a lacy appearance. The parietal peritoneum lines the pelvic and abdominal cavities.
Where is the lesser sac?
Lesser sac. The lesser sac or omental bursa is a potential peritoneal space within the abdomen, part of the peritoneal cavity .
What are the boundaries of the lesser sac?
Boundaries. As the lesser sac is a peritoneal space, all of its boundaries are lined by visceral or parietal peritoneum. anterior. lesser omentum. visceral peritoneum along posterior stomach. gastrocolic omentum (between greater curvature of stomach and transverse colon) left lateral. gastrosplenic and splenorenal ligaments.
What is the lesser omentum?
The lesser omentum is composed of two peritoneal ligaments that extend from the lesser curvature of the stomach and duodenal bulb to the liver, the gastrohepatic, and hepatoduodenal ligaments, respectively .
Which peritoneum covers the kidneys?
visceral/parietal peritoneum that covers diaphragm, pancreas, left kidney/adrenal gland, and duodenum. transverse mesocolon (between transverse colon and anterior surface of pancreas) superior. peritoneum covering caudate lobe of the liver.
Which organ is separated from the pancreas by the lesser sac?
Stomach – Separated from the pancreas by the lesser sac, the stomach and pylorus lie anterior and to the pancreas.
Where is the pancreas located?
With the exception of the tail of the pancreas, it is a retroperitoneal organ, located deep within the upper abdomen in the epigastrium and left hypochondrium regions.
What is the clinical relevance of pancreatitis?
Clinical Relevance: Pancreatitis. Pancreatitis refers to inflammation of the pancreas – this is can be acute or persist over an extended period (chronic pancreatitis). The causes of pancreatitis can be remembered using the mnemonic – GET SMASHED: G all stones.
What is the term for inflammation of the pancreas?
Pancreatitis refers to inflammation of the pancreas – this is can be acute or persist over an extended period (chronic pancreatitis ). The causes of pancreatitis can be remembered using the mnemonic – GET SMASHED:
What is the head of the pancreas?
Head – the widest part of the pancreas. It lies within the C-shaped curve created by the duodenum and is connected to it by connective tissue. Uncinate process – a projection arising from the lower part of the head and extending medially to lie beneath the body of the pancreas.
Which artery supplies the pancreas?
The pancreas is supplied by the pancreatic branches of the splenic artery. The head is additionally supplied by the superior and inferior pancreaticoduodenal arteries which are branches of the gastroduodenal (from coeliac trunk) and superior mesenteric arteries, respectively.
Where is the bile duct located?
Common bile duct – Descends behind the head of the pancreas before opening into the second part of the duodenum alongside the major pancreatic duct through the major duodenal papilla
What does the lesser sac contain?
The lesser omentum is composed of two peritoneal ligaments that extend from the lesser curvature of the stomach and duodenal bulb to the liver, the gastrohepatic, and hepatoduodenal ligaments, respectively.
Is lesser sac retroperitoneal?
There are two main regions of the peritoneum connected by the epiploic foramen: the greater sac or general cavity of the abdomen, and the lesser sac or omental bursa. ... Retroperitoneal structures tend to be more static than intraperitoneal ones.
Is pancreas in the lesser sac?
BACKGROUND. The pancreas is a retroperitoneal structure located behind the stomach and lesser omentum; it is composed of four anatomic regions: head, neck, body, and tail. The head lies medial to the C-loop of the duodenum. The neck lies anterior to the mesenteric vessels and portal vein.
Is spleen retroperitoneal?
Which organs are intraperitoneal? We've got the liver, the spleen, the stomach, the first part of the duodenum. ... The retroperitoneal organs are the kidneys at the back. You can see the kidneys here.
What is hepatorenal recess?
Morison's pouch is an area between your liver and your right kidney. It's also called the hepatorenal recess or right subhepatic space. Morison's pouch is a potential space that can open up when fluid or blood enters the area.
What causes ascites fluid?
Ascites Causes Ascites happens when pressure builds up in the veins of your liver and it doesn't work as it should. These two problems usually are caused by another condition -- cirrhosis, heart or kidney failure, cancer, or an infection. The pressure blocks blood flow in the liver.
How do the greater and lesser sacs communicate?
The omental bursa or lesser sac is a hollow space that is formed by the greater and lesser omentum and its adjacent organs. It communicates with the greater sac via the epiploic foramen of winslow, which is known as the general cavity of the abdomen that sits within the peritoneum, but outside the lesser sac.
What are the boundaries of lesser sacs?
Boundaries of lesser sac are as follows: Anterior wall is formed by (from above downwards): Lesser omentum. Posterior surface of stomach covered by peritoneum. Anterior two layers of greater omentum. Posterior wall consists of (from above downwards): Peritoneum covering the structures forming stomach bed.
What are the parts/subdivisions of lesser sac?
Vestibule: part of lesser sac immediately to the left of epiploic foramen. It is a constricted area between the left gastropancreatic fold of peritoneum (produced by left gastric artery) and right gastropancreatic fold (raised by common hepatic artery)
Why does the lesser sac get filled with fluid?
The lesser sac may get filled with fluid as a result of perforation of gastric ulcer on the posterior wall of stomach or from an inflamed pancreas to form pseudopancreatic cyst.
Which part of the intestine can herniate through the epiploic foramen into the lesser sac?
4.1.1 A loop of intes tine may herniate through the epiploic foramen into the lesser sac.
Where is the alternate approach to the intestinal loop?
The alternate approach is along the cleavage between the greater omentum and transverse mesocolon. The intestinal loop is deflated and then the loop of small intestine is withdrawn through the epiploic foramen.
Where is the epiploic foramen located?
Epiploic foramen/Foramen of Winslow: Is the communication between the greater and lesser sac. Is located at the level of the T12 vertebra. Its boundaries are: Anteriorly: free edge of lesser omentum containing within its layers: Bile duct (in front and to the right) Hepatic artery (in front and to the left0.
The peritoneum
The visceral peritoneum is the continuation of the parietal peritoneum which leaves the posterior wall of the abdominal cavity to invest certain viscera. Between the parietal and visceral layers of the peritoneum is a potential space (the peritoneal cavity).
The peritoneal cavity is divided into two sacs
Greater sac accounts for most of the space in the peritoneal cavity, beginning superiorly at the diaphragm and continuing inferiorly into the pelvic cavity, It is the part of the peritoneal cavity just behind the anterior abdominal wall.
Which compartment is the greater sac?
The greater sac extends from the diaphragm to the pelvic cavity. It is divided into the supracolic and infracolic compartments by the transverse mesocolon. The supracolic compartment is found anterior and superior to the transverse mesocolon, and contains the liver, stomach and spleen.
Where does the lesser omentum attach to?
The lesser omentum extends superiorly from the lesser curvature of the stomach and proximal duodenum to the liver.
What is the fold of the peritoneum that suspends organs from the posterior abdominal wall?
The mesentery is the folds of peritoneum that suspend organs from the posterior abdominal wall. Mesentery (diagram) The projection of an organ into the peritoneum creates a peritoneal fold which extends from the abdominal wall, wraps around that organ, and extends back to the abdominal wall.
How do organs push into the peritoneum?
As organs develop and grow, they push into the peritoneum without entering the peritoneal cavity. The cavity squeezes through any available space that exists between the abdominal organs forming peritoneal folds and pouches. It is the same idea as pressing your hand into a balloon filled with water; the balloon changes shape around your hand but your hand doesn’t go inside the balloon. Likewise, no organs lie within this potential space.
What are the two layers of the peritoneum?
The peritoneum consists of two layers: 1 Parietal peritoneum – an outer layer which adheres to the anterior and posterior abdominal walls. 2 Visceral peritoneum – an inner layer which lines the abdominal organs. It's made when parietal peritoneum reflects from the abdominal wall to the viscera.
What is the peritoneum?
So let’s start with the basics; the Peritoneum is a serous membrane which lines the walls of the abdominal cavity and lies on abdominal and pelvic organs. Between its two layers – parietal and visceral – is the peritoneal cavity.
What are the two divisions of the peritoneal cavity?
There are two divisions of the peritoneal cavity: lesser sac (omental bursa) and greater sac.
Where is the pancreas located?from brainscape.com
Location. The pancreas sits in the upper abdomen, at the level of the L1 and L2 vertebrae of the lower back, and it slants slightly as it moves across the posterior abdominal wall. 2 To its right is the duodenum, which wraps around the head of the pancreas, and to its left is the spleen.
What is the thickest part of the pancreas?from brainscape.com
The head of the pancreas is the thickest part of the gland, measuring 2 to 3 cm
What causes pancreatitis in the body?from kenhub.com
The most common causes of acute pancreatitis include gallstones (obstruction of pancreatic flow), and alcohol (increase in pancreatic enzyme synthesis). Acute pancreatitis manifests by severe epigastric pain, nausea, and vomiting. Physical examination reveals epigastric tenderness, hypoactive bowel sounds, fever, tachypnea, periumbilical and flank ecchymoses, and possibly jaundice if the cause is a gallstone. Laboratory investigations evidentiate elevated serum amylase and lipase levels. Management of acute pancreatitis involves fluid therapy, pain control, and close monitoring, and treatment of the underlying cause.
Why is the pancreas considered an organ?from kenhub.com
The pancreas is a unique organ because it fulfills both exocrine and endocrine roles. Its exocrine function includes the synthesis and release of digestive enzymes into the duodenum of the small intestine. Its endocrine function involves the release of insulin and glucagon into the bloodstream, two important hormones responsible for regulating glucose, lipid, and protein metabolism.
What are the two types of cells that make up the pancreas?from verywellhealth.com
Most of the remaining cells are endocrine cells , and make up portions of the pancreas called “islets of Langerhans;” these are associated with hormone production that can access the bloodstream directly.
Which artery provides innervation of the spleen?from osmosis.org
Finally, splenic innervation is provided by nerve fibers of the celiac plexus, which course along the splenic artery. OK, now let’s take a quick break and try to recall the name and origin of the artery supplying the spleen. Alright, now let’s shift gears and talk about the pancreas.
Where does the splenic artery run?from osmosis.org
After arising from the celiac trunk, the splenic artery takes a tortuous path posterior to the omental bursa, and runs along the superior border of the pancreas, ending at the splenic hilum.
Which artery is considered to be a long the___ border of the pancreas?
The splenic artery is considered to be a long the___ border of the pancreas.
What chapter is pancreas diagnostic sonography?
Start studying Chapter 12 pancreas diagnostic sonography. Learn vocabulary, terms, and more with flashcards, games, and other study tools.
Where is the d kidney?
d) posterior to the left kidney, near the splenic hilum
Which organ is anterior to the inferior vena cava?
c) the head of the pancreas is anterior to the inferior vena cava (IVC),
Which lobe is superior to the caudate lobe?
The head of the pancreas is superior to the caudate lobe
Where is the anterior kidney located?
anterior to the left kidney, near the splenic hilum
