NS 9 and 10 Flashcards
(41 cards)
define touch
the sensory experience when mechanoreceptors are excited
define mechanoreception
detection of mechanical stimuli
define exteroception
give information about things coming into contact with the body
define proprioception
awareness of position
mechanoreceptors and PDL mechanorecepors are what type of receptors?
exteroceptors
list the proprioceptors
- PDL mechanoreceptors
- muscle spindles
- joint receptors
- golgi tendon organs
- inner ear
what do the oro-facial mechanoreceptors in the mucosa detect?
food texture etc
it is important for mastication
the PDL mechnoreceptor is there for the…
forces on teeth
what do muscle spindles detect?
muscle length
what do joint receptors detect?
joint position and movement
what is the effect of stimulation of mechanoreceptors?
- sensation of touch
- reflexes ;
- jaw muscle reflex and salivary reflex - chewing gum
- interact/modulate other sensory modalities ie the effect of rubbing a painful area
rapidly adapting stimulus
few action potentials
slow adapting stimulus
many action potentials
what is the receptive field?
the area/space where a stimulus will affect the receptor
what is RA I and RA II?
- RA I = rapid adaptive, small receptive field
- RA II = rapid adaptive and large receptive field
What is SA I and SA II?
- SA I = slowly adapting and small receptive field
- SA II = slowly adapting and large receptive field
the meissner corpuscles belongs to which receptors?
RA I
List the features of the meissner corpuscles
small receptive field low threshold present in: - oral mucosa - vermilion border hard palate
name an RA II receptor?
pacinian corpuscle
features of the Pacinian corpuscles
- deep in mucosa
- large receptive field
- very low threshold
- rare in oral mucosa
name an SA I receptor
merkel cell
how low is the threshold in merkel cells?
as low as 1mg
where are merkel cells present?
tongue, lips and cheeks
raffini endings are which type of receptors?
SA II
