In the Anapanasati Sutta, what is the difference between mind and mental processes?

The book Breath by Breath by Larry Rosenberg splits the Anapanasati Sutta into 4 tetrads. The wildmind website does a similar thing. In the second tetrad there is a verse that is rendered > He trains himself to breathe in sensitive to mental processes, and to > breathe out sensitive to mental processes. and in the third tetrad there is the verse > He trains himself to breathe in sensitive to the mind, and to breathe > out sensitive to the mind. What is the difference between mental processes and the mind? In their English translations they look very similar. What is the original Pali words or phrases? Do they have difference translations or nuances that may make the differences clearer.