Anatomy-Autonomic of Thorax

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Anatomy-Autonomic of Thorax
2011-11-01 20:41:36
Anatomy Autonomics

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  1. Parasympathic Pre-ganglionic cell body
    Vagus-Dorsal motor
  2. Parasympathetic Post-ganglionic cell body
    wall of organ (Terminal Ganglion)
  3. Parasympathetic transmitters
    Nicotinic receptor and Muscarinic receptor
  4. Function of parasympathetic dividsion
    • decrease heart rate
    • increase saliva-watery
    • bronchoconstriction
  5. sympathetic pre-ganglionic cell body
    IMC (intermediolateral cell column) T1-L2
  6. sympathetic post-ganglionic cell body
    • Superior cervical ganglion
    • sympathetic chain ganglion
    • prevertebral ganglion (celiac, sup. mesenteric, inf. mesentaric)
  7. sympathetic transmitters
    • Acetylcholine-pre-ganglionic (uses for sweat from parasympathetic)
    • Norepinephrine-post. ganglionic)
    • Alpha 1 receptor
    • Beta 1 receptor
    • Beta 2 receptor
  8. Sympathetic function
    • increase heart rate
    • decrease exocrine secretion
    • Alpha 1: constriction-skin, GI tract, and skeletal muscle at rest; decrease water secretion, increase mucus
    • Beta 2 receptor-vasodilation-skeletal muscle
  9. Where do fibers take gray ramus for sweating?
    Spinal n.
  10. Where do fibers go for pupil dilation?
    Takes internal carotid n. to cavernous sinus
  11. Each preganglionic fiber synapses with __________ postganglionic neurons
    • many
    • 1:20
  12. Visceral branches to...
    thoracic viscera
  13. Splanchnic brances to...
    • Abd. viscera
    • T5-9
  14. Superior cervical n.
  15. Middle cervical n.
  16. Inferior Cervical n.
  17. What responds to ischemia and stretch of internal organs?
    • Visceral afferents-get to sympathetic chain via a visceral branch
    • Reaches spinal nerve in a white ramus (myelinated)
    • cell body in dorsal root ganglion
  18. Vagus n. affect with referred pain
    • No pain
    • supplies visceral afferents
  19. Cardiac Plexus
    • Superficial cardiac plexus
    • Deep cardiac plexus
    • Sympathetic fibers
    • Parasympathetic fibers
  20. Superficial cardiac plexus
    • ant. to arch of aorta
    • receives left superior cervical sympathetic cardiac n. and left inferior cervical parasympathetic cardiac n.
  21. deep cardiac plexus
    • ant. to tracheal bifurcation
    • receives all cardiac contributions from sympathetic chain and vagus on right and all but two on the left
    • includes visceral branches from first 4 sympathetic ganglia
  22. sympathetic fibers
  23. parasympathetic fibers
    preganglionic-will synapse in wall of heart and lungs
  24. distribution of cardiac plexus
    • predominatly to left heart from left side and vice versa but not exclusively
    • fibers from both system to: SA and AV nodes, atria
    • fibers from sympathetic system to: ventricles, coronary arteries (vasodilation)
  25. Pathway from plexus to heart follows
    • Great vessels-leave cardiac sac-leave crevus to put n. fibers in
    • dorsal mesentary (reflection of pericardium from posterior wall to left atrium)-used to be vertical now horizontal; attached to l. atrium in front of bifurcation of trachea
  26. What happens if heart loses n. supply?
    • example-transplant
    • it beats-SA and AV nodes automatic-do not need n. supply
    • n. supply is essential for rapid changes in rate
  27. Does the heart regenerate?
    • has been seen
    • does not know if it hooks up functionally