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AUTONOMIC NERVOUS SYSTEM [ANS] DISCUSSION. Dr. Zahoor. Q.1 What is Autonomic Nervous System (ANS )? It’s the part of efferent division of PNS, but it is involuntary. Q2 . What are the divisions of ANS ? Sympathetic Autonomic Nervous System Parasympathetic Autonomic Nervous System

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Q.1 What is Autonomic Nervous System (ANS)?

It’s the part of efferent division of PNS, but it is involuntary.

Q2. What are the divisions of ANS?

  • Sympathetic Autonomic Nervous System
  • Parasympathetic Autonomic Nervous System

Q3. Give the origin of Sympathetic ANS and Parasympathetic ANS?

Sympathetic ANS thoracolumber outflow.:

  • T1- T12 and L1 – L2/L3

Parasympathetic ANS craniosacral outflow :

  • cranial nerves: III, VII, IX, X
  • sacral segments :S2,3,4.
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Q4. Draw diagram of Sympathetic and Parasympathetic ANS showing two neurons. [Preganglionic and Postganglionic neuron]
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Q5.What is the difference between the length of Preganglionic and Postganglionic fiber in parasympathetic and parasympathetic ANS?

sympathetic:

  • Preganglionic fibers are shorter _ because they originate from the sympathetic cian:
  • Postganglionic fibers are longer

parasympathetic :

  • Preganglionicfibers are longer
  • Postganglionic fibers are shorter – near effecter organ-

Q6. What is the chemical transmitter at

Sympathetic ANS

Preganglionic Fibers Chemical Transmitter - acetylcholine

Postganglionic Fibers Chemical Transmitter – NE or NA

Parasympathetic ANS

Preganglionic Fibers Chemical Transmitter - acetylcholine

Postganglionic Fibers Chemical Transmitter - acetylcholine

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Q8. Name the adrenergic receptors where nor-epinephrine and epinephrine acts?

Q9. What types of adrenergic receptors are present in the following?

i. Heart β1

ii. Bronchi β2

iii. Blood vesselα1

iv. Skeletal muscle blood vesselβ2

v. GIT α2

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Q10. What is the chemical transmitter at postganglionic sympathetic nerve ending supplying sweat glands?  

acetylcholine

Q11. Acetylcholine released at postganglionic parasympathetic nerve ending act on Muscarinicreceptors at target or Effector organ.

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Q12. What receptors are present at the ganglion in Sympathetic ANS and Parasympathetic ANS?

Nicotinic receptors

Q13. What is Adrenal Medulla?

modified sympathetic ganglion. It does not give postganglionic fibers, but secretes epinephrine and nor-epinephrine directly into the blood, therefore, it is called Endocrine gland.

Q14. What hormones are released by adrenal medulla?

  • Adrenal medulla secretes

- 80% Epinephrine

- 20% Norepinephrine

comparison of sympathetic parasympathetic ans
COMPARISON OF SYMPATHETIC & PARASYMPATHETIC ANS

SYMPATHETIC

ANS

PARASYMPATHETIC

ANS

  • Origin
  • Organization
  • Chemical Transmitters
  • Actions
  • Receptors
  • Dominance
  • Drugs acting on adrenergic and muscarinic receptors

Do the comparison yourself