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Flashcards in ANS Deck (20)
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1
Q

autonomic NS

A

motor pathway includes 2 neurons; preganglionic and postganglionic

2
Q

sympathetic NS

A

thoracolumbar; fight or flight;

axons exit through ventral roots of spinal nerves

3
Q

preganglionic fibers SNS

A

leave spinal nerves through white rami into sympathetic ganglia

4
Q

postganglionic fibers SNS

A

extend out from sympathetic ganglia to visceral effectors

5
Q

adrenal gland exception

A

some preganglionic fibers extend to adrenals to release norepinephrine and epinephrine

6
Q

parasympathetic NS

A

craniosacral; CN III, VII, IX, X, S2-4; preganglionic long and myelinated, postganglionic are short and unmyelinated

7
Q

cholinergic fibers

A

fibers that secrete acetylcholine; preganglionic fibers; postganglionic parasympathetic fibers; sympathetic postganglionic sweat glands; sympathetic fibers in blood vessels to muscles and skin

8
Q

adrenergic fibers

A

fibers that secrete norepinephrine; most postganglionic sympathetic fibers

9
Q

adrenergic receptors

A

on effector cells; alpha 1,2 and beta 1,2

10
Q

alpha 1 receptor

A

post synaptic, vascular smooth m., stimulation = vasoconstriction, increases BP

11
Q

alpha 2 receptor

A

presynaptic, auto-inhibitory to NE release, vascular smooth m., decreases BP

12
Q

beta 1 receptor

A

post synaptic; cardiac m., increases heart rate

13
Q

beta 2 receptor

A

post synaptic; nonvascular smooth m., respiratory, digestive, uterine

14
Q

blood pressure

A

= HR x SV x TPR

15
Q

atropine

A

anticholinergic; suppress salivation and respiratory secretions

16
Q

ephedrine

A

stimulates release of norepinephrine from postganglionic sympathetic nerve endings

17
Q

reserpine

A

inhibits sympathetic; prevents norepinephrine synthesis

18
Q

pilocarpine

A

parasympathetic effects

19
Q

tricyclic antidepressants

A

prolong activity of norepinephrine on postsynaptic membrane

20
Q

betablockers

A

adrenergic blocker that attaches mainly to B1 receptors of cardiac muscle reducing heart rate