The mesentery is the tissue connected to the intestine
thru which the blood vessels, lymphatics, lymph nodes, nerves, etc.
Reside. The mesentery attaches the intestine to the back-wall of the abdominal cavity--there is no "free" margin, unless a portion of the intestine is surgically removed. The pathologists then look at this edge and tell us what is present. I hope this is what u were looking4.