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Neuro #20.txt
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What are the three encapsulated somatosensory mechanoreceptors?
Meissner's corpuscle
Pacinian corpuscle
Raffini corpuscle
What are three non-encapsulated somatosensory mechanoreceptors?
Merkel cell
free nerve endings
hair follicle receptor
Where are
Meissner's corpuscle
found?
Papillae epidermal layers (most superficial)
Where are
Pacinian corpuscle
located?
Hypodermis
T/F: Myelination occurs within the spiral layers of Meissner's corpuscle?
True
False
False, but there are still Schwann cells
Where are
Merkel's cells
located?
Epidermal ridges
Which of the mechanoreceptors are the
primary afferent nerve fibers
?
Merkel's cells
What are the two proprioceptors?
Golgi tendon organs (GTOs)
Muscle spindle
Are nociceptors free nerve endings or hair follicle receptors?
Free nerve endings (but not all free nerve endings are nociceptors)
What are the three
nociceptors
? When fired?
Mechanonociceptor:
tissue damage
Thermonociceptor:
noxious levels >45 C, <17C
Chemonociceptor:
chemical, algesic mediators
A-β
What type of nociceptor does
capsaisin
bind to?
Thermonociceptor
What type of free nerve ending fibers can
Capsaisin
destroy?
C fibers (smallest of all)
What is
Sensory transduction
?
How the body makes a mechanical stimulus into an electrical signal
-Touch
-open cation channels
-Na+ moves in depolarizing cells
Is the
muscle spindle
SA or RA
SA
What is
primary hyperalgesia
?
Chemical nociceptors
Threshhold decreased
Axons release NT and substance P = Inflammation
What is
secondary hyperalgesia
?
Chemical nociceptor
Threshhold decreased of A-delta and C-fibers
Are A-delta and C-fibers myelinated or not?
Both, just depends where
Author
kepling
ID
76042
Card Set
Neuro #20.txt
Description
Neuro #20
Updated
2011-03-29T23:18:50Z
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