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Autonomic nervous system (ans)

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Autonomic nervous system (ans)

  1. 1. Saddam Ansari 2nd year Tbilisi State Medical University AUTONOMIC NERVOUS SYSTEM (ANS)
  2. 2. Introduction  Portion of nervous system  Regulation of visceral functions  Also known as vegetative or involuntary nervous system
  3. 3. Sympathetic Division  Called as thoracolumbar outflow  Supplies smooth muscle fibers of visceral organs Blood vessels Heart Lungs Glands Gastrointestinal organs etc.
  4. 4. Continued…  Consists of pre and post ganglionic fiber
  5. 5. Sympathetic Ganglia Classified into 3 groups 1. Paravertebral or sympathetic chain ganglia 2. Prevertebral or collateral ganglia 3. Terminal or peripheral ganglia
  6. 6. Sympathetic Chain Ganglia Arrangement- Segmental fashion Location- Anterolateral surface of vertebral column
  7. 7. Division of Sympathetic chain Ganglia 1.Cervical ganglia-8cervial ganglia into 3 groups • Superior cervical ganglion • Fusion of upper 4 cervical ganglia • Middle cervical ganglion • Fusion of 5th and 6th cervical ganglia • Inferior cervical ganglion • Fusion of 7th and 8th cervical ganglia
  8. 8. Continued… 2.Thoracic ganglia 12 thoracic ganglia present on each side Preganglionic fibers originates form thoracic segment of spinal cord Postganglionic fibers are distributed into thorax and abdomen
  9. 9. Continued… 3.Lumbar ganglia • 5 lumbar ganglia • Preganglionic fibers arises form L1 and L2 segments and reach the lumbar ganglia. • Postganglionic fibers supply the abdominal and pelvic organs: • Urinary bladder • Colon etc.
  10. 10. Continued… 4.Sacral ganglia  5 sacral ganglia  Receives preganglionic fibers from L1 and L2 segments  Postganglionic fibers innervates blood vessels and sweat glands in lower limb
  11. 11. Prevertebral or Collateral Ganglia Situated in thorax,abdomen and pelvis Preganglionic fibers arises from T5 to L2 segments Prevertebral ganglia are : Celiac ganglion Superior mesenteric ganglion Inferior mesenteric ganglion
  12. 12. Terminal or Peripheral Ganglia  Situated within or close to structures innervated by them.  E.g. heart, bronchi, pancreas and urinary bladder.
  13. 13. Sympathoadrenergic System  Includes sympathetic division and adrenal medulla  Adrenal medulla is modified sympathetic ganglion.  Increase in sympathetic activity increases the secretion of catecholamines.

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