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Autonomic Nervous System Physiology. Dr Tony Morrissey Speciality Doctor Anaesthetics 25/09/13. What will be covered. ANS Definition Functions Structure SNS PNS Hypothalamus. ANS – Definition. The system which regulates non-voluntary bodily functions, by means of reflex pathways.

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autonomic nervous system physiology

Autonomic Nervous System Physiology

Dr Tony Morrissey

Speciality Doctor Anaesthetics

25/09/13

what will be covered
What will be covered
  • ANS
    • Definition
    • Functions
    • Structure
    • SNS
    • PNS
    • Hypothalamus
ans definition
ANS – Definition
  • The system which regulates non-voluntary bodily functions, by means of reflex pathways.
  • Divided into PNS and SNS on the basis of anatomical, pharmacological and functional differences.
ans functions
ANS – Functions
  • Responsible for homeostasis
  • Except for skeletal muscle all organs are supplied by the ANS.
  • Nerve terminals:
    • smooth muscle
    • Cardiac muscle
    • Glands
  • Includes enteric nervous system
ans structure
ANS – Structure

http://www.medicalook.com/human_anatomy/systems/Autonomic_nervous_system.html

ans v pns
ANS v PNS

http://www.cliffsnotes.com/sciences/anatomy-and-physiology/the-nervous-system/the-autonomic-nervous-system

sympathetic nervous system
Sympathetic Nervous System
  • Output in thoracic and lumbar segments of spinal cord
  • Ganglia form sympathetic trunk
  • ACh released at preganglionic nerve endings
  • Adrenaline and NA released at postganglionic nerve endings
  • “Fight or flight”
parasympathetic nervous system
Parasympathetic Nervous System
  • Output from cranial and sacral nerves
  • Ganglia near target organs
  • ACh released as NT at pre- and postganglionic nerve endings
  • “Rest and digest”
hypothalamus
Hypothalamus
  • Part of brain
  • Forms floor of 3rd ventricle
  • Controlling area for ANS
    • SNS mostly posteromedial
    • PNS mostly anterolateral
  • Also temperature regulation and hormone secretion by pituitary
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