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.