Final answer:
The three structures that supply the digestive organs with blood vessels, pancreas, spinal nerves, lymph nodes, and nerves are the mesenteric arteries, gastro-omental arteries, and pancreaticoduodenal arteries.
Step-by-step explanation:
In Biology, the three structures that are sandwiched between the two folds of mesenteries and supply the digestive organs with blood vessels, pancreas, spinal nerves, lymph nodes, and nerves are the mesenteric arteries, the gastro-omental arteries, and the pancreaticoduodenal arteries.