In anatomy, the mesentery is that the double layer of peritoneum that suspends the jejunum and ileum from the posterior wall of the abdomen. Its that means, however, is usually extended to incorporate double layers of peritoneum connecting varied parts of the abdominal cavity. The mesentery correct (i.e. the first definition) refers to the peritoneum accountable for connecting the jejunum and ileum (parts of the tiny intestine) to the rear wall of the abdomen. Between the 2 sheets of peritoneum are blood vessels, lymph vessels, and nerves. this enables these components of the tiny intestine to maneuver comparatively freely inside the abdominopelvic cavity. The brain, however, cannot map sensation accurately, therefore sensation is sometimes said the midline, an example of referred pain.
The root of correct mesentery extends fifteen cm from duodenojejunal flexure at the amount of left facet of L2, obliquely (toward inferior right) to the ileocecal junction within the right iliac fossa at the amount of right sacroiliac joint. the basis of mesentery crosses the second and third components of duodenum, abdominal aorta, Inferior vena cava, right ureter, right psoas major muscle, and right gonadal artery.
Development
The mesentery springs from what's known within the embryo because the dorsal mesentery. The dorsal mesentery is larger than the ventral mesentery, that gradually becomes alternative components of the peritoneum. Most components of the ventral mesentery are related to the liver.
Mesentery (general)
Mesenteries are composed of 2 layers of peritoneum. The peritoneum that lies on the walls of the abdominopelvic cavity (parietal peritoneum) invaginates at sure components, with an organ within this invagination. This invaginated peritoneum (visceral peritoneum) can typically surround all however a district of the organ ("bare area"), through that the organ transmits blood vessels and nerves. If this organ is invaginated way enough into the peritoneum, the visceral peritoneum can are available in contact with itself, forming the organ's mesentery.
Mesenteries within the body:
Mesentery (proper) - surrounds components of the tiny intestine (the jejunum and therefore the ileum)
Mesocolon - surrounds components of the colon
Meso-appendix - peritoneum of the vermiform appendix
Transverse mesocolon - peritoneum of the transverse colon
Sigmoid mesocolon - peritoneum of the sigmoid colon
Broad ligament of the uterus - peritoneum of the uterus, uterine tubes, and ovaries
Mesovarium - peritoneum of the Ovary
Mesometrium - peritoneum of the Uterus
Mesoalpinx - peritoneum of the Uterine tube