somato-sensory system Flashcards
sensory receptors with encapsulated nerve endings
meissner (or tactile) corpuscles
pacinian (or lamellated)
corpuscles
ruffini corpuscles
sensory receptors with unencapsulated nerve endings
merkel (or tackle) discs
free nerve endings
‘encapulsated nerve endings’
means they can filter out frequencies
to give specific frequencies
meissner corpuscles location
dermal papillae of skin esp hands, palms, eyelids, lips, tongue ec
modality of messier corpuscles
light touch, texture (movement)
sensitive to 30-50 Hz
rapidly adapting
pancinian corpuscles location
dermis
joint capsules
viscera
pancinian corpuscles modality
deep pressure stretch tickle vibration sensity to 150-350 Hz rapidly adapting
ruffini corpuscles location
dermis
subcutaneous tissue
joint capsules
ruffini corpuslces modality
heaving touch, pressure, skin stretch
joint movements
slowing adapting
merkel discs location
superficial skin (epidermis)
merkel discs modality
light touch, texture , edges shapes
slowing adapting
free nerve ending locations
widespread in epithelia and connective tissue
free nerve ending modality
pain, heat and cold
hair follicles location
widespread in epithelia
hair follicles modality
varied according to type
both rapid and slowly adapting subtypes
different classes of machine receptor response
phasic and tonic
tonic
slowing adapting
continue to response as long as the stimulus is present (info about persistence of stimulus)
e.g. ruffini corp