Topic Test 4 - Part 3C (temp and proprioception)

Question 1

temperature is detected by_

Answer 1

thermoreceptors

Question 2

describe thermoreceptors

Answer 2

• varying sensitivities to hot and cold temperatures
• cold (Ad & C fibers) and hot (C fibers)
• adapt to long durations of stimuli
  *follow the same pathway as pain (conscious signal of temp will follow same synapse at dorsal horn, crossover, ventrolateral path through spinothalamic pathway)

Question 3

describe what happens to cold and warm receptor firing rates as skin temp changes

Answer 3

as skin temp decreases, cold receptor increases firing rate
- over time, starts to fade a bit
- when we see increased temp, warm receptors increase firing rate

Question 4

describe proprioception

Answer 4

• our perception of the location and movement of our body
• allows us to control limb and joint position for optinmal movement
• group 1 neurons (Aa, fastest because need to react as fast as possible when moving)
• 2 primary receptors (muscle spindle and golgi tendon organ)

Question 5

describe the 2 primary proprioception receptors

Answer 5

muscle spindle: amount of stretch in a muscle
- tell us about length of muscle
- as muscle lengthens, Muscle spindles tell brain that muscle is stretched
golgi tendon organ: amount of force
(being applied to tendon)

Question 6

what 2 types of information do we have in proprioception?

Answer 6

conscious proprioceptive information
- dorsal column medial lemniscus pathway
unconscious proprioceptive information
- spinocerebellar tracts: to cerebellum
- spinal interneurons: spinal reflexes

Question 7

why is conscious/unconscious proprioceptive info important?

Answer 7

conscious - representation of where body is
unconscious - need to be able to react quickly, goes to cerebellum right away

Question 8

which axon types will use which pathways?

Answer 8

Aa & AB: primarily DCML
Ad & C: primarily spinothalamic tract