What hormone that from the brain tell the pancreas to release insulin?

I.e. what is the hormone or chemical that the brain releases and how does it travel to the pancreas through what path?
There isn't one. GLUT-2 transporters on beta islet cell of the pancreas allow the passive movement of glucose into the cell. elevated concentrations trigger the release of insulin. It is independent of the brain.
There isn't one. Actually, insulin is a hormone in of itself. It's really complicated.
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