Where is the machine's throat?

Error message on a Triton ATM

One of the problems of any industry is using specialized terminology that no one outside the industry understands.

So, my question is, where is the "throat" on an ATM? I presume it is where the machine either swallows deposits or vomits cash at the customer. I guess that I should just be thankful that the programmers didn't make use of the balance of the gastro-intestinal tract when naming parts of the machine.