A nurse recalls that characteristics of upper motor neurons include:
a. directly innervating muscles.
b. influencing and modifying spinal reflex arcs.
c. cell bodies located in the gray matter of the spinal cord.
d. dendritic processes extending out of the CNS.
ANS: B
Upper motor neurons are completely contained within the CNS. Their primary roles are control-ling fine motor movement and influencing/modifying spinal reflex arcs and circuits. They do not innervate muscles. Lower motor neurons interact with gray matter. Dendrites are part of neurons.
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