What Is A Simple Neuronal Analogy?

The shape of the neuron cell body and axon is to the shape of the brain and spine as what? The nucleus of the neuron is the neuron as what? Neurons are to the brain as to what? The impulse is the neurons as what? The myelin sheath is to the axon as what? Dendrites are to connections between neurons as what? Electrical and chemical signals are to adjacent neurons as what?