You read it very properly. Thank you.
I think the expression missed the woods, looking only on trees applies for me in this case. For years I have fun reading about the functions of the brain's neuronal circuits as connected to behaviors, and having not expanded to the central nervous system as a hole I connected the word neuron with brain only. So the: I think cells in the nervous system outside the brain are not called neurons, anyway.
was bad,but most importantly returning to the main question, I got my answer,
the process of signal transmission through fibers (that must reach the brain) is a spatial continuous electrochemical process (I think this expression is proper) taking place again with neurons and their axons, dendrites and synapses as contact points where ions of Na+, K+ ,Ca+ are exchanged.
As also it was said before:
But if the synapses are empty space, with no direct connection between one neuron's axon terminals and another's dendrites, then how does the message travel? The cells must send chemical signals across the gap. Within each axon terminal are sacs, known as vesicles, filled with one of 50 different chemicals called neurotransmitters. Each neurotransmitter sends a different type of message to the next neuron, which recognizes the neurotransmitters with specialized receptors on the surface of the dendrites.
PS Just for other people who either didn't know or may not want to devote the time to get more acquainted with the subject, I'm adding these that one can find after a little search on the magical internet.
"Sensory neurons: These run from the various types of stimulus receptors, e.g., touch, odor, taste, sound, vision to the central nervous system (CNS), the brain and spinal cord."
"All neurons outside the central nervous system (and many within it) conduct impulses along hairlike cytoplasmic extensions, the nerve fibers or axons. .....The axons connecting your spinal cord to your foot can be as much as 1 m long (although only a few micrometers in diameter)."
"Parts & Functions of the Central Nervous System. Neurons are the basic units that make up the nervous system. ... Motor neurons transmit information between organs, glands and muscles. Sensory neurons send information to the brain and spinal cord from internal organs or external stimuli encountered by the parts of the body ...."
"There are many billions of nerve cells, also called neurons, in the nervous system. The brain alone has about 100 billion neurons"