Synapses
A chemical synapse is the distinguishable gap (between 15-200nm wide)[1] between the axon terminal of one neurone cell and the dendrites of another. Electrical signals are able to continue across a chemical synapse due to the activity of neurotransmitters.[2]
An electrical synapse is a physical connection between two neurones and electrical signals are able to pass straight through from one neurone to the other without the help of neurotrasmitters.[3]