Conversation so far:
Where are upper motor neuron cell bodies located
Upper motor neurons are found in the cerebral cortex and brainstem.
what is the function of upper motor neuron cells
Upper motor neurons control the activity of lower motor neurons, which control the activity of muscles to produce movement.
why are upper motor neuron cells important
Upper motor neuron cells are the main source of voluntary movement.

Question: who discovered the cells
Self-contained rewrite: who discovered upper motor neuron cells