Mesentery

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Mesentery
Gray1038.png
Horizontal disposition of the peritoneum in the lower part of the abdomen. The mesentery is marked with red.
Gray1035.png
Vertical disposition of the peritoneum. Main cavity, red; omental bursa, blue.
LatinMesenterium
Gray'ssubject #246 1157
MeSHMesentery
 
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Mesentery
Gray1038.png
Horizontal disposition of the peritoneum in the lower part of the abdomen. The mesentery is marked with red.
Gray1035.png
Vertical disposition of the peritoneum. Main cavity, red; omental bursa, blue.
LatinMesenterium
Gray'ssubject #246 1157
MeSHMesentery

In anatomy, the mesentery is the double layer of peritoneum that suspends the jejunum and ileum from the posterior wall of the abdomen. Its meaning, however, is frequently extended to include double layers of peritoneum connecting various components of the abdominal cavity.

Contents

Mesentery (proper)

The mesentery proper (i.e. the original definition) refers to the peritoneum responsible for connecting the jejunum and ileum (parts of the small intestine) to the back wall of the abdomen. Between the two sheets of peritoneum are blood vessels, lymph vessels, and nerves. This allows these parts of the small intestine to move relatively freely within the abdominopelvic cavity. The brain, however, cannot map sensation accurately, so sensation is usually referred to the midline, an example of referred pain.

The root of proper mesentery extends 15 cm from duodenojejunal flexure at the level of left side of L2, obliquely (toward inferior right) to the ileocecal junction in the right iliac fossa at the level of right sacroiliac joint. The root of mesentery crosses the second and third parts of duodenum, abdominal aorta, Inferior vena cava, right ureter, right psoas major muscle, and right gonadal artery.

Development

The mesentery is derived from what is known in the embryo as the dorsal mesentery. The dorsal mesentery is larger than the ventral mesentery, which gradually becomes other parts of the peritoneum. Most parts of the ventral mesentery are associated with the liver.

Mesentery (general)

Mesentery

Mesenteries are composed of two layers of peritoneum. The peritoneum that lies on the walls of the abdominopelvic cavity (parietal peritoneum) invaginates at certain parts, with an organ inside this invagination. This invaginated peritoneum (visceral peritoneum) will often surround all but a part of the organ ("bare area"), through which the organ transmits blood vessels and nerves. If this organ is invaginated far enough into the peritoneum, the visceral peritoneum will come in contact with itself, forming the organ's mesentery.

Mesenteries in the body:

Pathology

A lack of blood-supply to the mesentery causes mesenteric ischemia.

Invertebrate anatomy

In invertebrates, the term mesentery is used for any tissue that divides the body cavity (coelom) into partitions.

Additional images

Cookery

Among cooks, the mesentery is known as the crow.[1] In classical French cuisine, veal crow (French: fraise de veau) is typically blanched then cooked in stock, and sometimes subsequently fried.[2]

References

  1. ^ Oxford English Dictionary, s.v. "crow", http://dictionary.oed.com/cgi/entry/50054748 (accessed 8 May 2009)
  2. ^ Escoffier, A. 1979. The Complete Guide to the Art of Modern Cookery. Trans. H. L. Cracknell. New York: Wiley, 1979. page 310

External links