This summary outlines key information about nerve cells and nerve impulses from the document: - Neurons and glial cells are the two main cell types in the nervous system. Neurons transmit nerve impulses while glia support neuron function. - Neurons have dendrites, a cell body, and an axon. Dendrites receive signals and the axon transmits signals to other cells. - A nerve impulse is an electrical signal transmitted along the axon when the neuron is stimulated. It occurs via changes in the neuron's membrane potential and the selective opening/closing of ion channels. - The nerve impulse is regenerated at the nodes of Ranvier along myel