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A215 - block three > autonomic nervous system > Flashcards

autonomic nervous system Flashcards

1
Q

receives sensory information and innervates skeletal muscle (voluntary)

  • CNS and PNS components
A

somatic nervous system

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2
Q

innervates the viscera (organs)

  • influences smooth muscle, cardiac muscle, and glands of skin and viscera (involuntary)
  • CNS and PNS components
A

autonomic nervous system

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3
Q

“the boss” oversees all ANS activity

A

hypothalamus

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4
Q

“middle management”

A

brainstem autonomic nervous centers

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5
Q

“ordinary workers”

A

preganglionic and ganglionic neurons

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6
Q

collections of nerve cell bodies located in PNS

A

ganglia

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7
Q

uses motor neuron to go from CNS to skeletal muscle

A

somatic motor

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8
Q

uses motor neurons to go from CNS to target tissue

  • consists of two neurons (preganglionic and ganglionic)
A

autonomic motor

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9
Q

cell body located in CNS

  • its pre-ganglionic axon will synapse with the ganglionic neuron
A

pre-ganglionic neuron

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10
Q

synapses with the pre-ganglionic neuron (myelinated)

A

pre-ganglionic axon

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11
Q

cell body is located in autonomic ganglion (PNS)

it’s post-ganglionic axon will connect to the target tissue (effector)

A

ganglionic neuron

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12
Q

originates in lateral horns of T1-L2 region of spinal cord

  • ganglia are located close to vertebral column
  • “fight or flight” response/”emergency” situations
  • exercise, excitement, emergency
  • “mass activation” effect
A

sympathetic division (thoracolumbar)

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13
Q
  • originates in some cranial nerves and parts of the sacral region of the spinal cord
  • ganglia are located close to or within the target organ/tissue

-“rest and digest” response

  • digestion, diuresis, defecation
  • parasympathetic activity is usually discrete and localized
A

parasympathetic division (craniosacral)

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14
Q
  • cranial components are part of CN’s III (Oculomotor), VII (Facial), IX (Glossopharyngeal), and X (Vagus)
  • sacral components are from S2-S4 segments of the spinal cord (pelvic splanchnic nerves)
  • “rest and digest”
A

location and characteristics of parasympathetic division

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15
Q

S2-S4 segments of the spinal cord (internal abdominal area)

A

pelvic splanchnic nerves

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16
Q

1) cell bodies of preganglionic neurons located in parts of certain cranial nerves, or in the sacral part of the spinal cord

2) preganglionic axons synapse in terminal or intramural (inside wall) ganglia which are located close to or in the organ being innervated

3) postganglionic axons travel from the ganglia to the target organ

A

parasympathetic division pathway

17
Q
  • originates in lateral horns of T1-L2 region of spinal cord (thoracolumbar)
  • ganglia near the vertebral column
  • “fight or flight”
A

sympathetic division location and characteristics

18
Q
  • sympathetic trunk
  • white ramus
  • gray ramus
  • ganglia: paravertebral (next to vertebra; sympathetic trunk/chain) and prevertebral (collateral; located in front of vertebral column)
A

sympathetic division structures

19
Q

1) cell bodies of preganglionic motor neurons in the lateral horns of T1-L2 segments of the spinal cord

preganglionic axons exit to spinal nerve and then go into the:

2) white ramus (runs from spinal nerve to sympathetic trunk)

3) sympathetic trunks (long chains of axons on either side of vertebral column)

  • sympathetic trunk (paravertebral) ganglia

4) gray ramus (runs from the sympathetic trunk to a spinal nerve)

  • sympathetic postganlionic axons

5) splanchnic nerves: preganglionic axons that do not synapse in the sympathetic trunk ganglia

6) prevertebral (collateral) ganglia

  • splanchnic nerves synapse here
  • located in front of the vertebral column

7) sympathetic postganglionic axons (travel directly to target organ)

A

sympathetic division pathway components

20
Q
  • all preganglionic axons (of the sympathetic division) enter the sympathetic trunk via the white ramus

the preganglionic axons exit through anterior roots to spinal nerve to white ramus to sympathetic trunk

A

sympathetic division pathways

21
Q

some axons synapse in the sympathetic trunk and leave through the gray rami to spinal nerves out to the skin and blood vessels

A

spinal nerve pathway

22
Q

some axons synapse in the sympathetic trunk and leave anteriorly to go to thoracic organs (and to head/neck)

A

postganglionic sympathetic pathway

23
Q

some preganglionic axons leave the sympathetic trunk as splanchnic nerves go to prevertebral ganglia to synapse and head to abdominal and pelvic organs

A

splanchnic nerve pathway

A215 - block three (11 decks)

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