PHRM 203 - Autonomics - 2nd packet
Terms
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- Autonomic Nervous System
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- aka: involuntary nervous system
- anatomically is a motor (efferent system)
- regulates and coordinates vital internal functions: circulation, respiration, digestion, metabolism, body temp., excretion, ect
- internal homeostasis - keep the internal environment operating at a steady, optimal level - ANS (involuntary)provides motor innervation to:
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- heart
- smooth muscle: blood vessels, eyes, lungs, gastrointestinal tract, urinary bladder, uterus, etc.
- exocrine glands: sweat glands, lacrimal glands, pancreatic glands, gastrointestinal (digestive glands), etc. - ANS (involuntary) provides motor innervation to:
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- heart
- smooth muscle: blood vessels, eyes, lungs, gastrointestinal tract, urinary bladder, uterus, etc.
- exocrine glands: sweat glands, lacrimal glands, pancreatic glands, gastrointestinal (digestive glands), etc. - two divisions of the ANS
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- have diametrically opposite effects on most internal organs
- PARASYMPATHETIC DIVISION: conserving and restoring body energy; regulation of metabolism/digestion, waste elimination, etc.
-"rest and digest" function
- SYMPATHETIC DIVISION: Expenditure rather than conservation of erngy
-"fight or flight"
- for emergency situations - Autonomic Motor Nerves
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- Involuntary
- Innervate the heart, smooth muscle, and exocrine glands
- Two neuron chain
- First order neuron = preganglionic neuron
- Second order neuron = postganglionic neuron
- Effector organ - First order neuron
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- preganglionic neuron
- cell body lies within the CNS - Second order neuron
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- postganglionic neuron
- cell body lies within the peripheral ganglion - Effector organ
- organ innervated by an autonomic postglanglionic nerve
- Somatic Motor Nerves
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- Voluntary
- Innervate skeletal muscle
- Single neuronal path (no innervating ganglion)