Mesentery

Mesentery
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Horizontal disposition of the peritoneum in the lower part of the abdomen. The mesentery is marked with red.
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Vertical disposition of the peritoneum. Main cavity, red; omental bursa, blue.
Gray's subject #246 1157
MeSH Mesentery
Mesentery

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)

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


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Look at other dictionaries:

  • Mesentery — Mes en*ter*y (?; 277), n. [Gr. mesente rion, me sos + e nteron intestine: cf. F. m[ e]sent[ e]re.] [1913 Webster] 1. (Anat.) The membranes, or one of the membranes (consisting of a fold of the peritoneum and inclosed tissues), which connect the… …   The Collaborative International Dictionary of English

  • mesentery — (n.) fold of the peritoneum, early 15c., from medical L. mesenterium middle of the intestine, from medical Gk. mesenterion, from mesos middle (see MEDIAL (Cf. medial) (adj.)) + enteron intestine (see ENTERIC (Cf. enteric)). Related: Mesenteric …   Etymology dictionary

  • mesentery — [mes′ən ter΄ē, mez′ən ter΄ē] n. pl. mesenteries [ML mesenterium < Gr mesenterion < mesos,MID1 + enteron, intestine: see INTER ] a supporting membrane or membranes enfolding some internal organ and attaching it either to the body wall or to… …   English World dictionary

  • Mesentery — A fold of tissue which attaches organs to the body wall. The word mesentery usually refers to the small bowel mesentery which anchors the small intestine to the back of the abdominal wall. Blood vessels, nerves, and lymphatics branch through the… …   Medical dictionary

  • mesentery — noun (plural teries) Etymology: Middle English mesenterie, from Medieval Latin mesenterion, from Greek, from mes + enteron intestine more at inter Date: 15th century 1. a. one or more vertebrate membranes that consist of a double fold of the… …   New Collegiate Dictionary

  • mesentery — double membranes meeting in the midline above and below the viscera formed by the serous membranes in the peritoneal and pericardial cavities. The mesentery in the pericardial cavity disappears during embryonic development and most the the… …   Dictionary of ichthyology

  • mesentery — mesenteric, adj. /mes euhn ter ee, mez /, n., pl. mesenteries. Anat. the membrane, consisting of a double layer of peritoneum, that invests the intestines, attaching them to the posterior wall of the abdomen, maintaining them in position in the… …   Universalium

  • mesentery —   n. membrane enclosing intestines.    ♦ mesenterial,    ♦ mesenteric, a.    ♦ mesenteritis, n. inflammation of mesentery …   Dictionary of difficult words

  • mesentery — n. [Gr. mesos, middle; enteron, gut] A supporting membrane or one that forms a partition …   Dictionary of invertebrate zoology

  • mesentery — noun The membrane that attaches the intestines to the wall of the abdomen, maintaining their position in the abdominal cavity, and supplying them with blood vessels, nerves, and lymphatics …   Wiktionary


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