Chapter 15: Visceral Reflexes Flashcards

1
Q

autonomic nervous system

A

a motor nervous system that controls viscera organs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

autonomic nervous system carries out actions _____

A

involuntarily

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Visceral reflexes make it all the way to the _______

A

brainstem

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

parasympathetic division

A

rest & digest

digestion and waste elimination

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

autonomic tone

A

normal background rate of activity that represents the balance between parasympathetic and sympathetic systems as the body changes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

parasympathetic tone

A

maintains smooth muscle tone in intestines

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

sympathetic tone

A

maintains blood pressure and keeps blood vessels constricted

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

ANS has components in the ___ and the ___such as what?

A

central and peripheral
nucleus of hypothalamus
motor neurons in spinal cord and peripheral ganglia

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

somatic vs. visceral motor pathway

A

somatic: myelinated axon reaches all the way to the skeletal muscle
visceral: must travel across two neurons to get to the target organ

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What are the 2 signals in autonomic output pathways?

A

presynaptic neuron cell body in CNS

postsynaptic neuron cell body in peripheral ganglion (reaches target organ cell & takes longer)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Why does the postsynaptic neuron signal take longer?

A

because the cell loses its myelination

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

sympathetic division is also called the _____

A

thoracolumbar division (thoracic and lumbar regions)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

sympathetic division has ____ preganglionic fibers which are found in the ___ ____and ____ postganglionic fibers

A

short;lateral horn; long

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

chain of ganglia

A

paravertebral ganglion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

sympathetic division preganglionic fibers are _____ and _____ while the postganglionic fibers are ____ .

A

short myelinated

unmyelinated

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

what are 3 outcomes of the preganglion of sympathetic chain

A
  • end in ganglia
  • travel up and down the chain
  • pass through the chain without synapsing
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

how can nerve fibers leave the sympathetic chain? (3)

A
  • spinal nerves
  • sympathetic nerves
  • splanchnic nerves
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

spinal nerve route

A

making it through without synapse

exit ganglion by way of gray ramus and return to spinal nerve and travel the rest of the way to the target organ

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

splanchic nerve route

A

T5 to T12 pass through the ganglia without synapsing

20
Q

What are the 3 major collateral ganglia in the abdominal aortic plexus?

A
  • celiac
  • superior mesenteric
  • inferior mesenteric
21
Q

adrenal glands

A

on top of the kidneys

22
Q

parasympathetic division is called the _____

A

craniosacral division (brain to sacral region)

23
Q

parasympathetic division has ____ preganglionic fibers which are found in the ___ ____and ____ postganglionic fibers

A

long; cranial nerves (3,7,9,10); short

24
Q

___ ____ is less in the parasympathetic division than in the sympathetic division

A

neural divergence (wide spread effects)

25
enteric nervous system (3)
GUT - nervous system of the digestive tract - does not arise from the brainstem or spinal cord (no components in CNS) - has own reflex arcs
26
megacolon
massive dilation of bowel accompanied by abdominal distension & chronic constipation (WE NEED FIBER)
27
hirschsprung disesase
hereditary defect causing absence of the enteric system that will not allow passage of feces
28
All autonomic fibers secrete either ____ or ____
ACh or NE
29
____ is secreted by all pregang neurons in both divisions and all postgang ____ divisions
ACh; parasympathetic
30
What are 2 types of cholinergic receptors?
``` muscarinic receptors (all cardiac muscles, smooth muscles,and gland cells) nicotonic receptors (all post gang neurons of ANS) ```
31
___ is secreted by nearly all ______ postgang neurons
NE; sympathetic
32
alpha adrenergic receptors
usually excitatory
33
beta adrenergic receptors
usually inhibitory
34
Which effects tend to last longer than the other?para or sym? why?
sympathetic; because Ach released by parasympathetics is broken down quickly in synapse
35
dual innervation
most viscera receive nerve fibers from both para and sympathetic divisions but don't innervate an organ equally
36
dual innervation has ___ effects that oppose each other and ____ effects that produce a unified overall effect
antagonistic and cooperative
37
An example of a cooperative effect is?
saliva
38
What effector only receive sympathetic fibers
adrenal medulla
39
metics:____ while lytics:_____ sympathetic activity
enhance; suppress
40
in ANS the cerebral cortex
has an influence: anger, fear, anxiety
41
in ANS the hypothalamus
nuclei for primitive functions such as hunger, thirst, sex
42
in ANS midbrain, pons, and medulla oblongata
salivation, swallowing, bladder control
43
vasomotor tone
a baseline firing frequency of sympathetics that keeps vessels in state of partial constriction
44
increase firing frequency
vasoconstriction
45
decrease firing frequency
vasodilation