I
input: nearby cortex
output: nearby cortex
II
input cortex, brainstem
output: ipsilateral cortex
III
input: cortex, brainstem
output: contralateral cortex
IV
inputs: thalamus, cortex, brainstem
no major outputs
V
inputs: cortex, brainstem
outputs: spinal cord, brainstem
VI
inputs: brainstem
output: thalamus