The end result is the simplest form of etching. There are more complicated ways to create more intricate etchings by using a number of different plates and colors. There is also a process to add different tones to the image that involves adding resin dust to the plate and heating it.
Nerves carry electrochemical signals to and from different areas of the nervous system as well as between the nervous system and other tissues and organs. Nerves are divided into four classes: Cranial nerves connect your sense organs (eyes, ears, nose, mouth) to your brain.
Nerve cells use a variety of chemical messengers called neurotransmitters to communicate with each other. Neurotransmitters serve to carry messages between nerve cells by crossing the synapse, or space between nerve cells. Neurotransmitters also allow nerves to communicate with muscle cells in order to create motion.