A good overview of this system primarily from the perspective of animal electrophysiology
Rizzolatti, G. & Luppino, G. (2001). The cortical motor system. Neuron, 31, 889–901.
A classic paper, predating brain imaging, that concerns the role of the prefrontal cortex in action. This paper is also relevant to Chapter 14 as it is a more general model of executive functions