Topic 19: Nervous System - PNS - Sensory division - receptors Flashcards

1
Q

After a stimulus, what happens?

A

stimulus -> receptor -> CNS

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2
Q

What two structures does the sensory division include?

A
  • receptors
  • first order neurons
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3
Q

What do receptors do?

A
  • detect changes in the environment
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4
Q

How are receptors classified by? (3)

A
  • location
  • type of stimulus received
  • structure of receptor (general senses only)
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5
Q

What are exteroreceptors? (2)

A
  • stimulus in external environment
  • ex. receptors at body surface
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6
Q

What are interoreceptors?

A
  • stimulus in internal environment
    ex. in viscera. blood vessels, etc.
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7
Q

What are proprioceptors?

A
  • in joints, skeletal muscle, etc.
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8
Q

What do proprioceptors monitor? (2)

A
  • body position (stretch receptors, muscle spindles)
  • balance and movement
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9
Q

Name the 3 types of stimulus receptors (5)

A
  • mechanoreceptors
  • thermoreceptors
  • chemoreceptors
  • photoreceptors
  • nocireceptors
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10
Q

What are mechanoreceptors?

A
  • mechanical stimuli (pressure, touch, hearing)
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11
Q

What are thermoreceptors?

A
  • temperature
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12
Q

what are chemoreceptors?

A
  • chemical
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13
Q

What are photoreceptors?

A

light

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14
Q

What are nocireceptors?

A
  • pain
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15
Q

What are free nerve endings?

A
  • terminal dendrites of unipolar neurons
    ex. pain, root hair plexus
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16
Q

What are encapsulated nerve endings?

A
  • terminal dendrites enclosed in CT
    ex. meissner’s corpuscles and pacinian