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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. 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

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  1. Autonomic Nervous System Physiology Dr Tony Morrissey Speciality Doctor Anaesthetics 25/09/13

  2. What will be covered • ANS • Definition • Functions • Structure • SNS • PNS • Hypothalamus

  3. 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.

  4. 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

  5. ANS – Structure http://www.medicalook.com/human_anatomy/systems/Autonomic_nervous_system.html

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

  7. 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”

  8. 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”

  9. 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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