The message in a neuron starts at the dendrites, which are the branch-like extensions that receive signals from other neurons. When these signals are strong enough to reach a certain threshold, they trigger an action potential that travels down the axon. This electrical impulse then propagates to the axon terminals, where it can communicate with other neurons or target cells.
When neurotransmitters communicate an inhibitory message to the postsynaptic neuron:
a relay neuron is the neuron that picks up the message from the sensory neuron and delivers it to the motor neuron in the spinal cord or the brain
It is called an Interneuron
neurotransmitters
An Impulse
Electrical impulses.
Axon sends the message. Dendrite receives it.
An Impulse
excitatory message
That would be an interneuron otherwise known as an associative neuron.
Afferent
nerve impulses