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Nas > L14: Organisation Of The Autonomic NS > Flashcards

L14: Organisation Of The Autonomic NS Flashcards

1
Q

What are the main structures of a neurone

A

Cell body

Axon

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2
Q

What is the anatomical classification of the nervous system

A

Central nervous system

Peripheral nervous system

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3
Q

What is functional classification of the nervous sytem

A

Autonomic nervous system

Somatic nervous system

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4
Q

What does the autonomic nervous system involve

A

Sympathetic
Parasympathetic
Enteric

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5
Q

What is the general action of the autonomic nervous system

A

Maintains homeostasis

Promotes excretory mechanism of the body when necessary

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6
Q

What are the effector organs of the autonomic system

A

Visceral organs

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7
Q

What does the visceral organs of the autonomic system involve

A

Smooth muscle
Secretory glands
Cardiac muscle

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8
Q

Is the somatic nervous system under voluntary or involuntary control

A

Voluntary control

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9
Q

Is the autonomic system under voluntary or involuntary control

A

Involuntary

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10
Q

What is the general layout of the autonomic nervous system

A

2 neurones in series
1 cell body in the cns
1 cell body in the PNS

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11
Q

What are the 2 neurones in the series called

A

Pre ganglion

Post ganglion

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12
Q

What neurotransmitter does the pre ganglionic axon of the parasympathetic ns release

A

Acetylcholine

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13
Q

What neurotransmitter does the post ganglionic axon of thf the parasympathetic ns release

A

Acetylcholine

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14
Q

Which receptor does acetylcholine from the parasympathetic pre ganglion act on

A

Nicotinic receptor

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15
Q

Which receptor does acetylcholine from the parasympathetic post ganglion act on

A

Muscarinic receptor

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16
Q

What neurotransmitter does the sympathetic pre ganglionic axon release

A

Acetylcholine

17
Q

What neurotransmitter does the sympathetic post ganglionic axon release

A

Noradrenaline or adrenaline

18
Q

What receptor does acetylcholine from the sympathetic pre ganglionic axon act on

A

Nicotinic receptor

19
Q

What receptor does adrenaline/noradrenaline from the post ganglionic axon act on

A

Alpha or beta adrenoceptors

20
Q

Describe the relationship of sympathetic and parasympathetic ns

A

Dual innervation but have opposite effects

21
Q

How is the overall dominant effect from SNS and PNS action determined

A

From the balance of the PNS and SNS outputs

22
Q

What innervation does sweat glands receive

A

Sympathetic only

23
Q

Which 2 sources are origination of autonomic fibres

A

Cranial sacral source

Thoracolumbar sources

24
Q

Which source is for parasympathetic

A

Cranial-sacral

25
Q

Which source is for sympathetic

A

Thoracic-lumbar sources

26
Q

What is a thoracic lumbar source

A

All segments of the spinal cord between T1-L2

27
Q

What is the crania-sacral source

A

Cranial nerves: 3,7,9,10

Spinal cord: S2,S3,S4

28
Q

Where are parasympathetic pre-ganglionic neurones found in the body

A

Dorsal vagus motor nucleus
OR
Spinal segments S2-S4

29
Q

What is the action of parasympathetic CN3

A

Pupillary constriction

30
Q

What is the action of parasympathetic CN7

A

Serous secretions

31
Q

What is the action of parasympathetic CN9

A

Serous secretions

32
Q

What is the action of parasympathetic CN10

A

Laryngeal function -neck only
Rest of body
Viscera

33
Q

What is the major pre-ganglionic fibre in the parasympathetic system

A

Vagus nerve

34
Q

Where does the parasympathetic vagus nerve synapse for the post-ganglionic neurones

A

Walls of the target organ

35
Q

Where does parasympathetic pre-ganglionic CN3,7,9 terminate for the post-ganglionic neurone

A

At pre-ganglionic nucleus

36
Q

Where does the sympathetic pre-ganglions originate from

A

Spinal neural levels of T1-L2/3

37
Q

Where does sympathetic preganglionic neurones terminate into post-ganglions

A

3 ways:
Synapse at level of corresponding level
Synapse at different level (up or down)
Synapse in prevertebral chain

38
Q

What is the paravertebral chain

A

A chain lying also give the vertebral column bilaterally

39
Q

What is the prevertebral chain

A

Lies anterior to vertebral bodies in relation to carotid and abdominal aorta

Nas (23 decks)

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