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The Autonomic Nervous Syste1

The Autonomic Nervous Syste1 - The Autonomic Nervous System...

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The Autonomic Nervous System Autonomic Nervous System – system of motor neurons within the motor division of the peripheral nervous system that innervates smooth muscle, cardiac muscle & glands. - also known as the involuntary nervous system (subconscious control) & the general visceral motor system * see chart below for comparisons of the branches of the motor division of the PNS & the divisions of the autonomic nervous system Parasympathetic division: “resting & digesting” system… low energy use (low blood pressure, heart rate & respiratory rate), active digestion of food & elimination of waste; pupils of eyes are constricted & lenses accommodated for close vision Sympathetic division: “fight or flight” system… activated during emergency or threatening/stressful situations; rapid heart & breathing rate, greatly decreased gastrointestinal & urinary tract activity, pupils dilated. Visceral blood vessels are constricted & blood is shunted to active skeletal muscles Anatomy of the autonomic nervous system:
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