Introduction: Again, you are seeing a picture already viewed, but it was found at http://users.rcn.com. Welcome to every other part of the nervous system other than the brain and spinal cord. Here you are going to see that the PNS is broken down into even more systems.
Somatic System*Somatic System: Voluntary function, Refer to A Simple Example as a somatic function
~Also known as the conscious control of a muscle
Autonomic System
*Autonomic System: Involuntary function, beating of the heart, digestion of food, blood
Blood flow
~Control is sub-conscious and dual innervation
1. Sympathetic: “fight or flight” response
*Crucial in emergency situations
*Inhibits the digestive tract when triggered
*Triggers release of norepinephrine (adrenaline)
2. Parasympathetic: Slows down the response
* “house keeper,” promotes internal response of a relaxed state
*Triggers release of acetylcholine
Conclusion: That seemed brief! Remember to refer back to "A Simple Example" in the first part of this section to get more on the somatic system, which is voluntary. Next, we will take a look at the different sensory receptors we've been mentioning that play a major role.
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