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.
who discovered upper motor neuron cells
Upper motor neurons is a term introduced by William Gowers.

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