W21-L4: Autonomic Nervous System Flashcards Preview

Matt's Block 06 - Neuro block > W21-L4: Autonomic Nervous System > Flashcards

Flashcards in W21-L4: Autonomic Nervous System Deck (25):
1

Where do all the sympathetic pathways originate from?

all of sympathetic come out of thoraco lumbar region

2

Where do all the parasympathetic pathways originate from?

all of para are cranio (cranial nerves)-sacral

3

Do any autonomic pathways originate in cervical or lumbar enlargement?

No

4

What are the two columns of sympathetic ganglia?

Prevertebral ganglia
Para-verteberal ganglia

5

What are the pre-ganglionic fibres for both para and sympathetic fibres?

Lightly myelinated/unmyelinated, uses Acetylcholine on nicotinic receptors (longer in post-ganglionic)

6

What are the post-ganglionic fibres for both para and sympathetic fibres?

All unmeylinated, longer in sympathetic (NA, ACh on muscarinic) and parasympathetic ACh on muscarinic

7

T/F Autonomic pathways contrast with typical CNS circuits where glutamate and GABA are the primary transmitters

True

8

What is co-transmission?

More than one transmitter being released at one time

9

T/F More than one transmitter release site per axon in ANS to organs

True

10

What is extra-junctional receptors?

Receptors can be expressed remotely from the synapse

11

Where do the preganglionic neurons of the sympathetic lie in the spinal cord?

Intermediolateral cell column

12

What is the function of Paravertebral ganglia (sympathetic chain)?

primary source of vasoconstrictor neurons

13

What is the function of Prevertebral ganglia (sympathetic chain)?

primary source of neurons innervating non-vascular smooth muscle
eg airway, reproductive smooth muscle

14

What does divergence mean?

mechanism for coordinating effects in many tissues at once, Up to 200 ganglion neurons can be activated by one preganglionic neuron

15

What does convergence mean?

Prevertebral ganglion neurons integrate more signals from multiple inputs

16

What is the sympathoadrenal system?

adrenal medulla cells are innervated by sympathetic preganglionic
neurons release noradrenaline and adrenaline into the circulation broad activation of adrenoceptors throughout the body

17

What is the pelvic ganglia?

relay station; relatively little integration made up of parasympathetic ganglion neurons which have unusually long axons: vulnerable to surgically- induced injury and many sympathetic neurones

18

T/F sympathetic and parasympathetic systems always act antagonistically and in competition

False

19

What is an example of ANS genuine antagonistic actions?

Heart rate, Heart contraction, airway relaxation

20

What is an example of ANS functional antagonistic actions?

Pupil, bladder

21

What is an example of ANS different but not opposite actions?

serous Salivary vs mucous salivary, tear secretion, vasoconstriction

22

How do you distinguish sympathetic and parasympathetic nerves?

The only correct, unequivocal definition is anatomical: location of preganglionic neurons other properties are unreliable

23

T/F Most autonomic reflexes involve the brain (supraspinal reflex) rather than only the spinal cord (spinal reflex)

True

24

Where is the major integrative centre for autonomic function?

Caudal part of the NTS

25

What is the most important brain region for coordination of autonomic output?

Paraventricular nucleus

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