Anatomy and size of spinal motor neurons
The nucleus inside the cell body of neuron must direct production of the various proteins needed by the cell. However, neurons have long axonal processes, so neurons rely on axonal transport to rapidly carry the molecules produced in the nucleus to where they are needed to do their work in the axon termins. Reverse or retrrograde transport takes place as well.

A neuron can be an enormous single cell with an axon three feet in length.

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