CNS (Intro) Flashcards

1
Q

What structures does the CNS consist of? (2)

A

brain

spinal cord

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2
Q

What is the function of the CNS?

A
  • processes incoming sensory and outgoing motor messages

- involved in higher mental activities (ie. learning, memory, and reasoning)

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3
Q

What is the brain enclosed and protected by?

A

cranial cavity

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4
Q

What is the spinal cord enclosed and protected by?

A

vertebral canal

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5
Q

How are the nervous tissue in the CNS organized?

A

as gray and white matter

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6
Q

What is gray matter composed of? (3)

A
  • nerve cell bodies
  • bundles of unmyelinated nerve fibers
  • neuroglia (non-neuronal supportive cells)
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7
Q

What are neuroglia?

A

non-neuronal supportive cells

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8
Q

What is white matter composed of?

A

tracts (bundles of myelinated nerve fibers)

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9
Q

What are tracts?

A

bundles of myelinated nerve fibers

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10
Q

What is the neural canal region associated with the spinal cord (an adult brain structure)?

A

central canal

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11
Q

What does gray matter form in the spinal cord?

A

H-shaped inner core surrounded by white matter

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12
Q

Where is gray matter in the brain?

A

thin outer shell of gray matter (cortex) covers the core of white matter

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13
Q

What is a nucleus?

A

cluster of nerve cell bodies embedded within CNS

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14
Q

What is a ganglion?

A

aggregation of nerve cell bodies outside CNS

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15
Q

What type of nerves (2) and how many does the PNS have?

A

cranial nerves; 12 pairs

spinal nerves; 31 pairs

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