Lesser sac

This article is about abdominal cavity. For the bat, see lesser sac-winged bat.

Lesser sac
Details
Identifiers
Latin	bursa omentalis
MeSH	A01.047.025.600.678
TA	A10.1.02.402
FMA	19800
*Anatomical terminology* [edit on Wikidata]

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 (previously known as the Foramen of Winslow). In mammals, it is not uncommon for the lesser sac to contain considerable amounts of fat.

Anatomic margins

Anterior margin, named from the top to bottom margin:

Quadrate lobe of the liver, lesser omentum, stomach, gastrocolic ligament

Medial margin, named from the most anterior to the most posterior margin:

Gastrosplenic ligament, spleen, phrenicosplenic ligament

Posterior margin:

Left kidney and adrenal gland, pancreas

Inferior margin:

Greater omentum

Superior margin:

Liver ^[1]

If any of the marginal structures rupture their contents could leak into the lesser sac. If the stomach were to rupture on its posterior side though the leak would collect in the greater sac.

The lesser sac is formed during embryogenesis from an infolding of the greater momentum. The open end of the infolding, known as the omental foramen is usually close to the stomach.

Additional images

Schematic figure of the bursa omentalis, etc. Human embryo of eight weeks.
Diagrams to illustrate the development of the greater omentum and transverse mesocolon.
Omental bursa

References

↑ Shahani RB, Bijlani RS, Dalvi AN, Shah HK, Samsi AB. Massive upper gastrointestinal haemorrhage due to direct visceral erosion of splenic artery aneurysm. J Postgrad Med 1994;40:220–2. Full Text.

External links

"Lesser sac". Medcyclopaedia. GE. Archived from the original on 2012-02-05.
Anatomy photo:37:09-0100 at the SUNY Downstate Medical Center – "Abdominal Cavity: The Lesser Peritoneal Sac"
Anatomy image:8070 at the SUNY Downstate Medical Center

Anatomy of the peritoneum and mesentery

General

Abdominal

From ventral mesentery	Lesser omentum Hepatoduodenal ligament Hepatogastric ligament Liver Coronary ligament (Left triangular ligament Right triangular ligament Hepatorenal ligament) Falciform ligament (Round ligament of liver and Ligamentum venosum in it, but not of it)

From dorsal mesentery	Greater omentum Gastrophrenic ligament Gastrocolic ligament Gastrosplenic ligament Mesentery Transverse mesocolon Sigmoid mesocolon Mesoappendix Root of the mesentery Splenorenal ligament Phrenicocolic ligament Folds Umbilical folds Supravesical fossa Medial inguinal fossa Lateral umbilical fold Lateral inguinal fossa Ileocecal fold

Abdominal cavity	Greater sac Lesser sac Omental foramen

General	Cystohepatic triangle Hepatorenal recess of subhepatic space Abdominal wall Inguinal triangle Peritoneal recesses Paracolic gutters Paramesenteric gutters

Pelvic

Uterus/ovaries	Broad ligament of the uterus Mesovarium Mesosalpinx Mesometrium) Ovarian ligament Suspensory ligament of ovary

Recesses	Male Recto-vesical pouch Pararectal fossa Female Recto-uterine pouch Recto-uterine fold (Uterosacral ligament) Vesico-uterine pouch Ovarian fossa Paravesical fossa Retroperitonium

Spaces

Index of digestion

Description	Anatomy tract glands other Physiology enzymes Development

Disease	Congenital Neoplasms and cancer Inflammatory bowel disease Gluten sensitivity Other Symptoms and signs eponymous Blood tests

Treatment	Procedures Drugs anabolic steroids antacids diarrhoea and infection bile and liver functional gastrointestinal disorders laxatives peptic ulcer and reflux nausea and vomiting other Surgery

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Lesser sac

Anatomic margins

Additional images

See also

References

External links