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PTRS 852 > 6 > Flashcards

6 Flashcards

1
Q

Function of ANS

A

influenced by hypothalamus, maintains homeostasis - maintenance of an optimal internal environment
Regulates activity of internal organs and vasculature

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2
Q

Receptors of ANS

A

Mechanoreceptors
Chemoreceptors
Nociceptors
Thermoreceptors

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3
Q

Receptor that responds to pressure (aortic arch, carotid sinuses, and lungs) and stretch (distension of veins, bladder or intestines

A

Mechanoreceptors

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4
Q

Sensitive to chemical concentrations in blood located in carotid and aortic bodies (oxygen) medulla (hydrogen ions and carbon dioxide) and hypothalamus (blood glucose levels and electrolytes)

A

Chemoreceptors

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5
Q

Found throughout viscera and wall of arteries

most responsive to stretch and ischemia

A

Nociceptors

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6
Q

In hypothalamus responds to small changes in temp of circulating blood

A

Thermoreceptors

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7
Q

How info from visceral receptors enter CNS

A

Into spinal cord via dorsal root
Into brainstem via CN VII, IX and X
all three transmit taste, IX and X transmit info from viscera

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8
Q

Central regulation

A

Visceral infor converges in brainstem via solitary nucleus
Relayed to visceral control areas in pons and medulla
Relayed to modulatory areas in hypothalamus, Thalamus and limbic system

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9
Q

What does the medulla regulate through central regulation

A

HR, Respiration, Vasocontriction/dilation by signals to autonomic efferent neurons in spinal cord and vagus nerve

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10
Q

What does the pons regulate through central regulation

A

Respiration

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11
Q

Hypothalamus, thalamus, and limbic system modulate

A

Brainstem autonomic control

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12
Q

Visceral info sent from the thalamus is projected to

A

Limbic system

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13
Q

Hypothalamus: the overseers of ______

A

Homeostasis and ANS

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14
Q

Many regions of the brain supply the hypothalamus with info, but only the _______________ send sensory info directly to the hypothalamus

A

Olfactory system and small part of the visual system

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15
Q

Function of the limbic system

A

Emotion and memory

Influences motor and autonomic output via emotion

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16
Q

What composes the limbic system

A 
Hypothalamus
Nuclei of thalamus
Limbic cortex
Hippocampus
Amygdala
17
Q

Subsystems of the efferent pathway

A

Sympathetic

Parasympathetic

18
Q

Fight or flight system

A

Sympathetic

19
Q

Rest and digest system

A

Parasympathetic

20
Q

Where are cell bodies of the sympathetic preganglionic neurons located?

A

Lateral horn T1-L2

21
Q

Primary function of the sympathetic system

A

Maintain optimal blood supply to organs

Regulate body temp and metabolic rate, and activity of viscera

22
Q

Where are the preganlionic cell bodies of the parasympathetic system located

A

Brainstem (nuclei of CN III, VII, IX and X) and sacral spinal cord (S2-S4)

23
Q

Primary function of the parasympathetic system

A

energy conservation and storage

Decreases cardiac activity, facilitates digestion, and regulates activity of viscera

24
Q

Loss of vascular control, temp regulation, and sweating, may lead to trophic changes in the skin

A

ANS correlation with peripheral nerve injury

25
Q

Disrupts ascending and descending autonomic signals at level of lesion

A

ANS correlation with Spinal region injury

26
Q

complete lesion S2-S4 or cauda equina produces

A

flaccid bladder

27
Q

A lesion above the sacral cord results in

A

hypertonic/hyperreflexive bladder

28
Q

Lesion above T6 prevents

A

spinal cord from receiving signals from brain to inhibit sympathetic activity - noxious stimuli can cause autonomic dysreflexia

29
Q

Interfere with descending control of heart rate, blood pressure and respiration; affect cranial nerve nuclei

A

ANS correlation with brainstem injury

30
Q

Damage to hypothalamus disrupts homeostasis with metabolic and behavioral dysfunctions

A

ANS correlation with Cerebral injury

PTRS 852 (11 decks)

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