Exam 2: Nervous System I Flashcards

1
Q

Central Nervous System

A
  • brain and spinal cord
  • control center
  • president
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2
Q

Peripheral Nervous System (PNS)

A
  • cranial nerves, spinal nerves and ganglia
  • ganglion=group of neuron cell bodies located outside CNS
  • workers
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3
Q

Sensory (afferent) Division

A

receives information FROM body and transmits it TO CNS for processing
-has both CNS and PNS parts

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4
Q

Somatic Sensory

A
  • part of sensory division

- receives sensory information from skin, joints, muscle, special senses (vision, hearing, balance, smell, taste)

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5
Q

Visceral Sensory

A
  • part of sensory division

- receives sensory info from blood vessels and viscera

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6
Q

Motor Division

A

transmits info FROM the CNS To muscles and glands

-has both CNS and PNS parts

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7
Q

Somatic Motor

A
  • part of motor division
  • innervate skeletal muscle
  • voluntary
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8
Q

Autonomic Motor

A
  • part of motor division
  • innervates smooth muscle, cardiac muscle, and glands of viscera (organs)
  • involuntary
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9
Q

Neurons

A
  • respond to stimuli and conduct nerve impulses

- primarily amitotic

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10
Q

Glial Cells

A
  • support and protect neurons
  • many more glial cells than neurons
  • divide by mitosis
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11
Q

Cell Body of Neuron

A

-function: neuron’s control center or head

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12
Q

Nucleus

A
  • -houses DNA

- contains nucleolus for protein synthesis

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13
Q

Chromatophilic substances (Nissl bodies)

A
  • rough ER inside cell body
  • function: protein synthesis
  • look like darkened clumps within cytoplasm
  • no chromatophilic substance in axon hillock
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14
Q

Dendrites

A
  • short nerve cell process
  • function: receive input (incoming nerve impulses)
  • send nerve cells to cell body
  • neuron can have 1 or many dendrites
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15
Q

Axon

A
  • long nerve cell process
  • function: send output (outgoing nerve impulses
  • one axon per neuron
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16
Q

Axon Hillock

A
  • portion of the cell body from where the axon originates

- no chromatophilic substance here

17
Q

Multipolar Neuron

A
  • one axon and many dendrites
  • most common
  • ex: motor neurons, interneurons
18
Q

Bipolar Neuron

A
  • two processes: one axon and one dendrite
  • limited in location (rare)
  • ex: retina of eye, olfactory neurons in nose
19
Q

Unipolar (Pseudounipolar) Neuron

A
  • Single process comes off of the cell body and divides into two branches
  • common
  • most (not all) sensory neurons
20
Q

Sensory (afferent) Neuron

A
  • brings information TO CNS

- either unipolar or bipolar neurons

21
Q

Motor (efferent) Neuron

A
  • takes information FROM CNS to other parts of the body

- all are multipolar

22
Q

Interneuron

A
  • help coordinate and integrate info between sensory and motor neurons
  • located solely in CNS
  • “translator/mediator”
  • multipolar in form
23
Q

Neuron Classification

A

-by structure or by function

24
Q

Satellite Cells

A
  • In PNS
  • surround neuron cell bodies in spinal ganglia
  • protect the cell bodies
  • regulate nutrient exchange and waste removal
25
Neurolemmocytes (Schwann Cells)
- myelinate axons in PNS - myelin is a protective covering around axon that insulates axon and helps produce faster nerve impulses - can also help regenerate damaged PNS axons
26
Astrocytes
- in CNS - regulate transfer of materials from blood to the brain, help workings of BBB - helps make blood vessels less leaky
27
Blood Brain Barrier
- keeps harmful substances away from brain - selectively permeable - bust some needed substances can't pass this barrier either like chemotherapy drugs
28
Astrocytes and the BBB (Parkinsons)
- caused by a decrease of a dopamine - dopamine can't pass the BBB but a related drug, L-dopa, can. - Cocaine and methamphetamine pass through and damage BBB
29
Oligodendrocytes
- myelinates multipe axons in CNS | - to CNS as neurolemmocytes are to PNS
30
Microglia
- phagocytize damaged neurons in CNS | - replicate when there is CNS damage and need to clean up an area
31
Ependymal Cells
- line central canal and ventricles of CNS - help circulate CSF - central canal and ventricles are spaces within the spinal cord and brain respectively
32
Myelination
- process of wrapping an axon with myelin - myelin insulates axon, produces a faster nerve impulse - dendrites are not myelinated
33
Myelination Procedure in PNS
- Neurolemmocyte wraps around a 1 mm portion of an axon successively - Cytoplasm and nucleus of neurolemmocyte gets "squeezed" to the outside - inner successive layers of cell membrane make up the myelin sheath of neurolemocyte
34
Neurofibril Nodes (Nodes of Ranvier)
- separate neurolemmocytes - axon unmyelinated here - nerve impulse is generated at these nodes
35
Myelination in CNS
- one oligodendroyte myelinates 1 mm portions of many axons | - similar to PNS but oligodendrocytes myelinate CNS axons