"You may think that a sensory or motor neuron is like one long wire running through your body. Not so! In fact, neurons are more like small noodles, lined up in a row but not actually connected."
The linked page has numerous analogies that help to describe a motor neuron.
METAMIA is a free database of analogy and metaphor. Anyone can contribute or search. The subject matter can be anything. Science is popular, but poetry is encouraged. The goal is to integrate our fluid muses with the stark literalism of a relational database. Metamia is like a girdle for your muses, a cognitive girdle.