Lecture 8: Skin Receptors II Flashcards
What is a characteristic exclusive to type II corpuscles?
Having no distinct receptive field borders
Similarities between Meissner’s corpuscles and Merkel’s Discs:
Both have small, sharp borders
Similarities between Pascinian corpuscles and Ruffini’s endings:
Both have large, vague borders
Stimulus response of SAI and SAII:
Frequent
Stimulus response of FAI and FAII:
Slow firing, large gaps
The size and shape of objects touching the hand is coded for by ____:
SAIs
What happens if you use a small probe area on your finger?
- Higher discharge rates in fewer receptors
What happens if you use a large probe area on your finger?
- Individual receptors fire less, but more afferents will be active
Methods which might increase firing:
- More pressure
- Smaller probe area
How do receptors code for texture?
Patterns of dots generate specific stresses/strains across skin
Spatial event plots:
Instantaneous response of a hypothetical population of equally distributed and identical afferents
What skin receptor detects indentation best for Braille?
SAIs
Two factors when picking up an object:
Grip force and load (weight)
Which corpuscles have the best spatial event plots and which has the worst?
SAI- best
FAII- worst
Which corpuscle allows for the best reflex response and allows items not to slip?
FAI
