1 Roadmap for Quality Measurement in the Traditional Medicare Fee-for-Service Program [PDF, 3MB]. 2  Roadmap for Implementing Value Driven Healthcare in the Traditional Medicare Fee-for-Service Program [PDF, 3MB]. 3  Medicare Resource Use Measurement Plan [PDF, 3MB].
When a nerve signal, or impulse, reaches the ends of its axon, it has traveled as an action potential, or a pulse of electricity. However, there is no cellular continuity between one neuron and the next; there is a gap called synapse.
The gap where an electrical signal jumps from one neuron to another is called the synaptic cleft. This is a closeup of the cleft between one neuron and another. Since the impulse cannot cross a gap as electricity, it crosses as a message by means of chemical âmessengersâ called neurotransmitters.The reason that some neurons have special receptors for opiates is probably that there are naturally occuring opiates in the brain.). This causes the amount of dopamine in the synaptic clefts in the reward pathway to increase dramatically, as shown in the close-up of the synaptic cleft to the left.