L12 Flashcards
what are the 4 types of receptors located in the glabrous skin
- merkel cell
- meissner corpuscle
- pacinian corpuscle
- ruffini ending
how are the glabrous skin receptors classified
based on receptive field size and responses to sustained stimulation
what are the two type 1 receptors
fast adapting = meissner corpuscle
slow adapting = merkel cell
does the type 1 receptors have small or large receptive fields
small
what does the type 1 meissner corpuscle receptors tell us
anytime something moves across the surface of the skin (sheer)
what does the type 1 merkel cell receptors tell us
edges, ridges, curvatures, when a curve starts or stops
what are the two type 2 skin receptors
pacinian corpuscle = fast adapting
ruffini ending = slowly adapting
what type of receptor field do type 2 receptors have
large
what does the type 2 pacinian corpuscle tell us
high frequency vibrations
what does the type 2 ruffini ending receptor tell us
tells you about stretch of the skin (large play in proprioception)
what is microneurography used for
record biological signals from peripheral nerves in awake human subjects
what are the FAI and FAII receptors
FAI = meissner corpuscle
FAII = pacinian corpuscle
where are meissner corpuscles located
in the glabrous skin within the dermal papillae
why would it be important or logical that 43% of receptors in the hand are FAI
it tells you when something is slipping out of your hand or when something is moving across your hand such as a pencil
how do these receptors get activated to cause an action potential
the elongated stack of epithelial cells have primary afferent terminals weaved between the layers so as the collagen fibers squish the epithelial cells causing them to mechanically activate the AP
