I consider it to be plural. It is not a compound noun. It is a shortening of "the blood supply and the nerve supply".
Student or Learner
Consider this text.
Pulp Soft tissue containing the blood and nerve supply to the tooth. The pulp extends from the crown to the tip of the root.
I am wondering
Is "The blood and nerve supply" a compound noun? if so
Am I correct to write "The blood and nerve supply is..... ?
Should I use "are" instead of "is"?
Is the phrase "The blood and nerve supply" plural or singular?
Could you also give me a term for this kind of grammar so that I can look up for more information about it?
I don't think nerves are supplied in the same way that blood is.