Nervous System Flashcards

1
Q

What are the 2 structural divisions of the nervous system?

A
  1. CNS

2. PNS

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2
Q

What does the CNS consist of?

A

Brain and spinal cord

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3
Q

What is the functional unit of the nervous system?

A

The neuron

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4
Q

List the major components of a neuron

A

Dendrite, cell body, nucleus, axon, myelin, nodes of Ranvier

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5
Q

What are the 3 principle functions of the nervous system?

A
  1. Sensory input
  2. Integration
  3. Sensory output
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6
Q

Which division is the afferent?

A

Sensory division

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7
Q

Which division is the efferent?

A

Motor division

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8
Q

What are the 2 divisions of the motor division?

A
  1. Somatic

2. Autonomic

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9
Q

What are the 2 divisions of the autonomic nervous system?

A
  1. Sympathetic

2. Para-sympathetic

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10
Q

What surrounds the nerve cells?

A

Glial cells

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11
Q

What are the general functions of glial cells?

A

Provide support, nutrition, insulation and help with signal transmission

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12
Q

What are the 4 glial cells of the CNS?

A
  1. Astrocytes
  2. Microglial cells
  3. Ependymal cells
  4. Oligodendrocytes
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13
Q

Functions of Astrocytes

A

Regulate ions, exchange materials between neurons and capillaries

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14
Q

Functions of Microglial cells

A

Immune Defense against invading microbes

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15
Q

Functions of Ependymal cells

A

Line cavities in the brain and spinal cord. Create, secrete and circulate cerebrospinal fluid

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16
Q

Functions of Oligodendrocytes

A

Wrap around neurons creating the insulation which is the myelin sheath

17
Q

What are the 2 types of glial cells of the PNS

A
  1. Satellite cells

2. Schwan cells

18
Q

Functions of the satellite cells

A

Surround cells and support and facilitate nutrition

19
Q

Function of Schwan cells

A

Produce insulating barrier called myelin sheath

20
Q

Definition of Amitotic

A

Once neuron takes on given role in nervous system, they lose their ability to divide

21
Q

What percent of daily caloric intake is used by your brain?

A

25%

22
Q

What is the outermost layer of a Schwann cell called?

A

Neurilemma

23
Q

What are the 3 functional categories of neurons within the CNS?

A
  1. Sensory neurons
  2. Motor neurons
  3. Interneurons
24
Q

Function of interneurons

A

Relay information from place to place within the CNS

25
Q

What are white fibers?

A

Myelinated axons

26
Q

What is the difference between white and grey matter in the brain?

A

White matter is myelinated and grey matter isn’t

27
Q

What are fiber bundles located in the CNS and PNS called, respectively?

A

Tracts and nerves

28
Q

Name 4 neuro transmitters

A
  1. Norepinephrine
  2. Seratonin
  3. Dopamine
  4. Acetylcholine
29
Q

Which neurotransmitter is present in the neuromuscular junction

A

Acetylcholine

30
Q

4 ways neurotransmitters are removed

A
  1. Reuptake
  2. disolved by Enzymes
  3. Used by glial cells
  4. Slow diffusion