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PHTH 7303 Neuro > Exam 3 Week 13 ppt 3 ANS innervation > Flashcards

Exam 3 Week 13 ppt 3 ANS innervation Flashcards

1
Q

Heart sympathetic- causes

A

stimulation increases rate & force of contraction

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2
Q

Heart sympathetic- efferent fibers from

A

the upper thoracic segments (T1-T6) Via cervical & upper thoracic ganglia

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3
Q

Heart sympathetic- innervates

A

~Innervation of sinoatrial (SA) & atrioventricular (AV) nodes
~atrial & ventricular cardiac muscle

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4
Q

Heart sympathetic- produces

A

~produce Positive chronotropic & dromotropic effects
~increases heart rate (chronotropic effect) and rate of conduction through the atria & specialized conduction system of the ventricles (dromotropic)
~produces Positive ionotropic effect both atria and ventricles (increased force of contraction)

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5
Q

Heart parasympathetic- causes

A

decreases in HR

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6
Q

Heart parasympathetic- efferent fibers from

A

Fibers of Vagus nerve (CN X)

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7
Q

Heart parasympathetic- innervates

A

~SA and AV node

~atrial muscle

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8
Q

Heart parasympathetic- produces

A

~decrease in heart rate and speed of conduction through the AV node (Negative chronotropic & dromotropic effects)
~only a variable negative ionotropic effect on atria only

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9
Q

Heart baroreceptors located

A

High pressure baroreceptors in carotid sinus & aorta

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10
Q

Heart baroreceptors- afferents from

A

brainstem via CN IX (glossopharyngeal) & CN X (vagus) from the baroreceptors in carotid sinus & aorta respectively

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11
Q

Heart baroreceptors- relay in

A

solitary nucleus

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12
Q

Heart baroreceptors- inhibits

A

~inhibit cardiac acceleratory center & excite cardiac inhibitory center
~Inhibit sympathetic & stimulate parasympathetic

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13
Q

vasculature sympathetic- produces

A

~vasoconstriction which will increase blood pressure

~

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14
Q

vasculature sympathetic- how do baroreceptors influence?

A

~Baroreceptor reflex afferents decreases sympathetic outflow so produces vasodilation
~causes Vasodilation & decreased heart rate & contractility decreases blood pressure

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15
Q

bladder sympathetic- located

A

spinal cord segments T11-L2 Via inferior mesenteric & pelvic ganglia

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16
Q

bladder sympathetic- produces

A

~relaxation of the detrusor
~contraction of the internal urethral sphincter
~preventing the bladder from emptying

17
Q

bladder parasympathetic- location

A

Originates from spinal intermediate gray of S2-S4

18
Q

bladder parasympathetic- produces

A

~contraction of the detrusor

~emptying of the bladder

19
Q

bladder external urinary sphincter- originates

A

Originates from S2-S3 (Onuf’s nucleus – S2)

20
Q

bladder external urinary sphincter- travels to bladder by

A

travels to the pelvic floor by the pudendal nerve

21
Q

bladder external urinary sphincter- what does it do

A

voluntarily prevent micturation until convenient to urinate

22
Q

what type of fibers send signals from the bladder?

A

A-delta fibers

23
Q

what to the fibers from the bladder do (and the path they travel)

A

~myelinated afferents (A-delta fibers) from the bladder- connected to the tension receptors in the bladder wall
~Relayed by neurons in dorsal horn of spinal cord to ascend in the dorsolateral funciculus, Relay in thalamus to end in insular cortex gives sensation of bladder “fullness”

24
Q

what is micturition controlled by?

A

pontine micturition center

25
Q

what does the pontine micturition center do?

A

~Stimulates parasympathetic producing detrusor contraction
~Inhibits sympathetic relaxing internal urinary sphincter
~Inhibits motor neurons relaxing external urinary sphincter
~allows Bladder to empty

26
Q

what excites pontine micturition center?

A

Excited by periaqueductal gray which was activated by afferents from bladder

27
Q

pontine storage center- excites

A

Excites Onuf’s nucleus

28
Q

pontine storage center- produces

A

closure of external urinary sphincter so decreased urination

29
Q

what are the cortical areas that are active during micturition

A

~Prefrontal cortex
~Anterior cingulate gyrus
~Supplemental motor area
~Insula

30
Q

sex organs sympathetic- innervation from

A

spinal cord segments T10-L2

31
Q

sex organs sympathetic- results in

A

~Vaginal contraction
~Penile ejaculation
~contraction of the internal urinary sphincter prevents retrograde emission of semen into bladder.

32
Q

sex organs parasympathetic- innervation from

A

spinal cord segments S2-S4

33
Q

sex organs parasympathetic- results in

A

secretion of vaginal glands, engorgement of the clitoris, and penile erection

34
Q

sex organs parasympathetic- disruption

A

Erectile dysfunction

PHTH 7303 Neuro (89 decks)

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