ANS Flashcards

(35 cards)

1
Q

Definition of autonomic nervous system

A

Involved in regulating internal environment of the body.

Has motor and sensory components

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2
Q

Definition of sensory fibres

A

Travel with motor fibres, cell bodies in posterior root ganglia, or in sensory ganglia of cranial nerve

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3
Q

Definition of motor fibres

A

Innervates smooth muscle and glands, modulate activity of ANS

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4
Q

Definition of sympathetic trunk

A

Pair of bundle nerve fibres that run from tp base of the skull to the sacrum

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5
Q

Purpose of the autonomic nervous system

A

Involved in regulating the internal environment of body

Have motor, sensory components

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6
Q

Location and what do sensory fibres travel with

A

Travel mainly with motor fibres as mixed fibres

Cell bodies in posterior root ganglia (sensory fibres of spinal nerves, sensory ganglia of cranial nerves

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7
Q

Function of motor fibres

A

Innervate smooth muscle, glands
Modulate activity of GIT, SAN
Has 2 neurons in series

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8
Q

Principle divisions of motor part of ANS

A

Sympathetic

Parasympathetic

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9
Q

Where does the sympathetic nervous system arise

A

T1-L2

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10
Q

Distribution of sympathetic nervous system

A

All parts of body wall and viscera

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11
Q

Function of sympathetic nervous system

A

Moderate visceral functions, HR, peristalsis, sweating

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12
Q

Pre and post ganglionic fibres in the sympathetic nervous system

A

Short myelinated preganglionic fibres

Long unmyelinated postganglionic fibres

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13
Q

Sympathetic divisions of the ANS, ganglia

A

Sympathetic paired chain ganglia
Collateral unpaired ganglia
Adrenal paired medullae

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14
Q

What effect does the sympathetic paired chain ganglia have?

A

Visceral effectors in thoracic cavity, head, body wall and limbs

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15
Q

What effect does the collateral unpaired ganglia have?

A

Visceral effectors in abdominopelvic cavity

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16
Q

What effect does the adrenal paired medullae have?

A

Organs and systems throughout body, through neurotransmitters in blood

17
Q

What is the sympathetic trunk?

A

Pair of uncle nerve fibres, run from base of skull to sacrum

18
Q

Effects of sympathetic stimulation on motor responses

A
Staring eyes
Cold clammy skin
Dry mouth
Hair standing on end
Sinking pit in stomach
19
Q

Effects of sympathetic stimulation on sensory fibres

A

Regulation of visceral activity
Only pain is conscious
Referred pain as brain’s map of SNS does not match actual location of pain

20
Q

Where does the parasympathetic nervous system arise

A

Cranio-sacral
Cranial nerves III, VII, IX, X
S2-S4

21
Q

Distribution of parasympathetic nervous system

A

Head and trunk only

22
Q

Function of parasympathetic nervous system

A

Regulating normal functions of organs it supplies

23
Q

Pre and post ganglionic fibres in the parasympathetic nervous system

A

Long myelinated preganglionic fibres

Short unmyelinated postganglionic fibres

24
Q

Locations of the preganglionic neurons in the Para NS

A

S2-S4

Brain stem

25
What ganglia does S2-S4 pass through?
Intramural ganglia through pelvic nerves
26
What ganglia does the brain stem pass through?
Intramural ganglia through NX
27
What does the intramural ganglia from the pelvic nerves affect?
Visceral organs in lower abdominopelvic cavity
28
What does the intramural ganglia from NX nerves affect?
Visceral organs of head, neck, thoracic cavity, and most of abdominal cavity
29
What does the thalamus affect?
Emotions | Sensory input
30
What does the hypothalamus affect?
Sympathetic, parasympathetic
31
What parts of the brain is affected by the hypothalamus
Pons | Medulla oblongata
32
Function of the pons
Higher levels of respiratory control
33
Function of the medulla oblongata
Processing centers for complex visceral reflexes (S and P)
34
What does the medulla oblongata control
Spinal cord T1-L2 Sympathetic visceral reflexes Sacral spinal cord Parasympathetic visceral reflexes and motor neurons
35
What are the effects of medulla oblongata control
``` Cardiac centers Vasomotor centers Swallowing center Coughing center Respiratory rhythmicity center ```