Mesentery

mesentericmesenteriestransverse mesocolonmesocolondorsal mesenterysigmoid mesocolonventral mesenteryMesoappendixdorsal mesogastriumantimesenteric
The mesentery is a contiguous set of tissues that attaches the intestines to the posterior abdominal wall in humans and is formed by the double fold of peritoneum.wikipedia
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Peritoneum

peritonealintraperitonealparietal peritoneum
The mesentery is a contiguous set of tissues that attaches the intestines to the posterior abdominal wall in humans and is formed by the double fold of peritoneum.
The mesentery is a double layer of visceral peritoneum that attaches to the gastrointestinal tract.

Small intestine

small bowelsmall intestinessmall
The mesentery of the small intestine arises from the root of the mesentery (or mesenteric root) and is the part connected with the structures in front of the vertebral column.
The jejunum and ileum are suspended in the abdominal cavity by mesentery.

Adipose tissue

adiposebody fatfat
It helps in storing fat and allowing blood vessels, lymphatics, and nerves to supply the intestines, among other functions.
Visceral fat is composed of several adipose depots, including mesenteric, epididymal white adipose tissue (EWAT), and perirenal depots.

Large intestine

coloncolorectallarge bowel
The mesentery becomes attached to the colon at the gastrointestinal margin and continues as the several regions of the mesocolon.
On the posterior side, the transverse colon is connected to the posterior abdominal wall by a mesentery known as the transverse mesocolon.

Retroperitoneal space

retroperitoneumretroperitonealretro-peritoneal organs
A plane occupied by perinephric fascia was shown to separate the entire apposed small intestinal mesentery and the mesocolon from the retroperitoneum.
Structures that are not suspended by mesentery in the abdominal cavity and that lie between the parietal peritoneum and abdominal wall are classified as retroperitoneal.

Ileum

terminal ileumilealsmall bowel
The mesoappendix is the portion of the mesocolon connecting the ileum to the appendix.
The ileum, along with the jejunum, is suspended inside the mesentery, a peritoneal formation that carries the blood vessels supplying them (the superior mesenteric artery and vein), lymphatic vessels and nerve fibers.

Mesothelium

mesothelialmembranemesothelial cell
A surface mesothelium and underlying connective tissue is universally apparent.
The mesothelium is a membrane composed of simple squamous epithelium that forms the lining of several body cavities: the pleura (thoracic cavity), peritoneum (abdominal cavity including the mesentery), mediastinum and pericardium (heart sac).

Appendix (anatomy)

appendixvermiform appendixvermiform
The mesoappendix is the portion of the mesocolon connecting the ileum to the appendix.
The appendix is connected to the mesentery in the lower region of the ileum, by a short region of the mesocolon known as the mesoappendix.

Foregut

fore-gutforegut developmentforegut tube
The gastrointestinal tract and associated dorsal mesentery are subdivided into foregut, midgut, and hindgut regions based on the respective blood supply.
Beyond the stomach, the foregut is attached to the abdominal walls by mesentery.

Transverse colon

transversecolon, transverseParts of transverse
The transverse mesocolon is that section of the mesocolon attached to the transverse colon that lies between the colic flexures.
It is almost completely invested by peritoneum, and is connected to the inferior border of the pancreas by a large and wide duplicature of that membrane, the transverse mesocolon.

Sigmoid colon

sigmoidsigmoid flexurecolon sigmoideum
The sigmoid mesocolon is that region of the mesentery to which the sigmoid colon is attached at the gastrointestinal mesenteric margin.
The sigmoid colon is completely surrounded by peritoneum (and thus is not retroperitoneal), which forms a mesentery (sigmoid mesocolon), which diminishes in length from the center toward the ends of the loop, where it disappears, so that the loop is fixed at its junctions with the iliac colon and rectum, but enjoys a considerable range of movement in its central portion.

Greater omentum

omentumomentalSplenorenal ligament
This section of the small intestine is located centrally in the abdominal cavity and lies behind the transverse colon and the greater omentum.
The greater omentum develops from the dorsal mesentery that connects the stomach to the posterior abdominal wall.

Duodenojejunal flexure

duodenojejunal junction
However, in 2012, new microscopic and electron microscopic examinations at the University of Limerick showed the mesocolon to be a single structure derived from the duodenojejunal flexure and extending to the distal mesorectal layer.
It lies in front of the left Psoas major and left renal vessels, and is covered in front, and partly at the sides, by peritoneum continuous with the left portion of the mesentery.

Organ (anatomy)

organorgansviscera
Thus, the mesentery is an internal organ.
The variations in natural language definitions of what constitutes an organ, their degree of precision, and the variations in how they map to ontologies and taxonomies in information science (for example, to count how many organs exist in a typical human body) are topics explored by writer Carl Engelking of Discover magazine in 2017 as he analyzed the science journalism coverage of the evolving scientific understanding of the mesentery.

Appendicular artery

It encloses the appendicular artery and vein, as well as lymphatic vessels, nerves, and often a lymph node.
It descends behind the termination of the ileum and enters the mesoappendix of the vermiform appendix.

Septum transversum

The development of the septum transversum takes part in the formation of the diaphragm, while the caudal portion into which the liver grows forms the ventral mesentery.
The septum transversum is a thick mass of cranial mesenchyme, formed in the embryo, that gives rise to parts of the thoracic diaphragm and the ventral mesentery of the foregut in the developed human being and other mammals.

Intestinal malrotation

malrotationmalrotation of the gutMalrotation of colon
During herniation, the midgut rotates 90° anti-clockwise around the axis of the SMA and forms the midgut loop.
The narrow mesentery predisposes some cases of malrotation to midgut volvulus, a twisting of the entire small bowel that can obstruct the mesenteric blood vessels leading to intestinal ischemia, necrosis, and death if not promptly treated.

Toldt's fascia

Between these is Toldt's fascia, a discrete layer of connective tissue.
It is found between the two mesothelial layers that separate the mesocolon from the underlying retroperitoneum.

Duodenum

duodenaldodecadactylumduodenal cap
The lesser omentum is formed, by a thinning of the mesoderm or ventral mesogastrium, which attaches the stomach and duodenum to the anterior abdominal wall.
The duodenal bulb is a remnant of the mesoduodenum, a mesentery which suspends the organ from the posterior abdominal wall in fetal life.

Volvulus

strangulationintestinal volvulusmidgut volvulus
Mesenteric ischemia can also result from the formation of a volvulus, a twisted loop of the small intestine that when it wraps around itself and also encloses the mesentery too tightly can cause ischemia.
A volvulus is when a loop of intestine twists around itself and the mesentery that supports it, resulting in a bowel obstruction.

Development of the digestive system

primitive gut
The primitive gut is suspended from the posterior abdominal wall by the dorsal mesentery.
Ventral mesentery, derived from the septum transversum, exists only in the region of the terminal part of the esophagus, the stomach, and the upper portion of the duodenum.

Ascending colon

ascendingascending portion of the coloncolon, ascending
The cranial portion of the loop will develop into the jejunum and most of the ileum, while the caudal part of the loop eventually forms the terminal portion of the ileum, the ascending colon and the initial two-thirds of the transverse colon.
Sometimes the peritoneum completely invests it and forms a distinct but narrow mesocolon.

Falciform ligament

falciform ligament of the liverfalciform
By the subsequent growth of the liver this leaf of mesoderm is divided into two parts – the lesser omentum between the stomach and liver, and the falciform and coronary ligaments between the liver and the abdominal wall and diaphragm.
It is a remnant of the embryonic ventral mesentery.

Gastrointestinal tract

intestinegastrointestinaldigestive tract
The mesentery is a contiguous set of tissues that attaches the intestines to the posterior abdominal wall in humans and is formed by the double fold of peritoneum.
These parts of the tract have a mesentery.