the junction between two neurons (axon-to-dendrite) or between a neuron and a muscle; "nerve impulses cross a synapse through the action of neurotransmitters"
a major part of the central nervous system which conducts sensory and motor nerve impulses to and from the brain; a long tubelike structure extending from the base of the brain through the vertebral canal to the upper lumbar region
sufficiently significant to affect the whole world; "earthshaking proposals"; "the contest was no world-shaking affair"; "the conversation...could hardly be called world-shattering"