Fill in the Blanks The structure of a neuronOnline version Helping to teach the features in a neuron and their functions by Jesse Eisenhower 1 body genetic impulse nerve material impulses neurons transmission body cell synapse protects sheath neuron cell neuron myelin Gaps contains Neurons vary in size but all share the same basic structure : Cell body ( or soma ) - includes a nucleus which the of the cell Dendrites - branch - like structures that protude from the cell body . These carry from neighbouring towards the . Axon - carries the electrical away from the down the length of the . It is covered by a fatty layer of that the axon . in the axon called nodes of ranvier speed up the of the impulse . Terminal buttons at the end of the axon communicate with the next in the chain across a gap called the .