Most broadly, the PFC chooses between conflicting options-Coke or Pepsi; blurting out what you really think or restraining yourself; pulling the trigger or not. And often the conflict being resolved is between a decision heavily driven by cognition and one driven by emotions. Once it has decided, the PFC sends orders via projections to the rest of the frontal cortex, sitting just behind it. Those neurons then talk to the "premotor cortex," sitting just behind it, which then passes it to the "motor cortex," which talks to your muscles. And a behavior ensues.
( Robert M. Sapolsky )
[ Behave: The Biology of Humans ]
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