A) columns of neurons extend from the surface deep into the cortex, each controlling (contralaterally) different groups of muscles around different joint
B) columns of neurons extend from the surface deep into the cortex, each controlling (contralaterally) a distinct muscle
C) columns of neurons extend laterally across the surface of the cortex, each controlling (ipsilaterally) a distinct muscle
D) clusters of neurons scattered on the cortical surface all have some input in controlling (contralaterally) most major muscles
E) clusters of neurons arranged in rows with each row controlling (contralaterally) a different muscle