Label the following components of the corticospinal tracts with numbers 1 through 6, with 1 being the origin of the tracts and 6 their destination.
_____Medullary pyramids where most fibers decussate.
_____Anterior horn of the spinal gray matter.
_____Midbrain and pons.
_____Upper motor neurons in the primary motor and premotor cortices.
_____Corona radiata and internal capsule.
_____Lateral funiculus of the spinal cord.