part of part of mesentery of small intestine UBERON:0001170 Wikipedia:Mesentery#Mesentery_.28proper.29 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[WP]. small intestinal mesentery small intestine mesentery SCTID:245456008 FMA:14643 MA:0001555 mesentery (proper) mesentery proper serosa of small intestine mesentery small intestine gastrointestinal system mesentery peritoneal mesentery