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Autonomic Nervous System (ANS) involuntary nervous system subconscious control

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Autonomic Nervous System (ANS) involuntary nervous system subconscious control consists of motor neurons that innervate smooth muscle, cardiac muscle and glands. ANS pathway uses two-neuron chain Preganglionic neuron in CNS

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Presentation Transcript
slide1
Autonomic Nervous System (ANS)
  • involuntary nervous system
  • subconscious control
  • consists of motor neurons that innervate smooth muscle, cardiac muscle and glands
slide2
ANS pathway uses two-neuron chain
    • Preganglionic neuron in CNS
    • Postganglionic neuron in ganglion outside CNS that extends to effector organ

Divisions of the ANS

  • Sympathetic and Parasympathetic division
  • Dual innervation-All visceral organs served by both divisions, but cause opposite effects
  • Dynamic antagonism between two divisions maintains homeostasis
slide3
Role of the Sympathetic Division
  • Mobilizes body during activity; "fight-or-flight" system
    • Increased heart rate; dry mouth; cold, sweaty skin; dilated pupils

Role of the Parasympathetic Division

  • Promotes maintenance activities and conserves body energy
    • Directs digestion, diuresis, defecation
    • Blood pressure, heart rate, and respiratory rates are low
slide4
Control of ANS Function
  • Hypothalamus—main control center of ANS activity
  • Other controls from cerebral cortex, reticular formation, and spinal cord
neurotransmitters
Neurotransmitters
  • Somatic nervous system
    • All somatic motor neurons release acetylcholine (ACh); effects always stimulatory
  • ANS
    • Preganglionic fibers release ACh
    • Postganglionic fibers release norepinephrine or ACh
    • Effect is either stimulatory or inhibitory,

depending on type of receptors receiving stimulus

slide6
Neurotransmitters
  • Cholinergic fibers release neurotransmitter ACh
    • All ANS preganglionic axons
    • All parasympathetic postganglionic axons at effector synapse
  • Adrenergic fibers release neurotransmitter NE
    • Most sympathetic postganglionic axons
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