Autonomic Nervous System

Question 1

Where do autonomic pathways NOT originate?

Answer 1

Cervical and lumbar enlargements

Question 2

What are the major points of origin in the spinal cord for the PNS and SNS respectively?

Answer 2

PNS: craniosacral
SNS: thoracolumbar

Question 3

What is the difference between PNS and SNS in terms of the location of their ganglia?

Answer 3

PNS: ganglia tend to be close to or within organs
SNS: ganglia more distant from organs

Question 4

What are the 2 main chains of ganglia for the SNS?

Answer 4

Prevertebral

Paravertebral (sympathetic chain)

Question 5

What is the difference in terms of myelination between pre-ganglionic and post-ganglionic neurons of the ANS?

Answer 5

Pre-ganglionic: lightly myelinated or unmyelinated

Post-ganglionic: all unmyelinated

Question 6

What is the NT and receptor in the pre-ganglionic synapse of the SNS?

Answer 6

ACh acting on nicotinic receptors

Question 7

What is the NT and receptor in the post-ganglionic synapse of the SNS?

Answer 7

Mostly NA acting on adrenoceptors

Few ACh acting on muscarinic receptors

Question 8

What is the NT and receptor in the pre-ganglionic synapse of the PNS?

Answer 8

ACh acting on nicotinic receptors

Question 9

What is the NT and receptor in the post-ganglionic synapse of the PNS?

Answer 9

ACh acting on muscarinic receptors

Question 10

Give an example of ACh acting on muscarinic receptors in the SNS post-ganglionic synapse

Answer 10

Cholinergic secretomotor axons innervating sweat glands