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Physiology

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Central Nervous System

Question
2 out of 22
 

Autonomic ganglion is mainly



A Cholinergic
B Adrenergic

C Dopaminergic
D Serotonergic


Ans. A Cholinergic

ANS (Autonomic Nervous system) Parasympathetic and sympathetic

1. Chemical transmission at autonomic junction:-(between pre and post-ganglionic neuron; and between the postganglion neurons and the autonomic effectors) “The principal transmitter agents involved are Acetyl choline and Non-epinephrine, although Dopamine is also secreted by interneurons in the sympathetic ganglia and GnRH is secreted by some of the preganglionic neurons

2. On the basis of the chemical mediator, ANS is divided into: I- Cholinergic division (Ach transmitter) And II- Nor-adrenergic division (Nor Ad transmitter)

3. Examples of cholinergic neurons:- (Ach transmitter)

a. All preganglionic neuron Q

b. Parasympathetic postganglionic neurons Q

c. Sympathetic post ganglion neurons which innervate sweat gland Q

d. Sympathetic neurons which ends in the blood vessels (= produce vasodilation) Q

4. Remaining post ganglionic sympathetic neurons are Noradrenergic Q

5. The highest seat regulating ANS is in hypothalmus; posterior and lateral nuclei and primarily sympathetic while anterior and medial nuclei are primarily parasympathetic

6. ICA cells (intrinsic cardiac Adrenergic cells) Epinephrine (Adenergic) arid norepinephrine.

7. The adrenal medulla is essentially a sympathetic ganglion in which the post ganglion cells have lost their axons and secrete norepinephrine, epinephrine, and some Dopamine directly into the blood stream.

8. Difference between sympathetic and paraysmpathetic division of ANS: -

Trait

Sympathetic

Parasympathetic

1. Origin Q

Dorso-lumbar (T1 to L2 or L3)

Craniosacral(III, VII, IX, X, S2-S4)

2. Ganglia Q

Away from the organ

On or close to organ

3. Distribution Q

Wide

Limited to head, neck and trunk

4. Post ganglionic fibers Q

Long

Short

5. Pre: Postganglionic fibers ratio Q

1:20 to 1:100

11 to 1:2 (except in enteric plexus)

6. Transmitter Q

Nor adrenaline (major)

Acetyl choline (Minor)

Acetyl choline

7. Function Q

Tacking stress and emergency

Assimilation of food conservation of energy

Central Nervous System Flashcard List

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