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Upper motor neuron
Upper motor neurons
are
motor neurons
that originate either in the
motor region
of the
cerebral cortex
or in the
brain stem
and carry motor information down to the
lower motor neurons
. The main effector or motor neurons (
efferent neurons
) for voluntary movement lie within layer V of the
primary motor cortex
and are a type of giant
pyramidal cell
called
Betz cells
. The
cell
bodies of these
neurons
are the largest in the brain, approaching nearly 0.1mm in
diameter
.
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