Touch Flashcards
what did aristotle say about touch
it makes us smarter than animals as we have smoother skin- it was nonsense
what is somatosensation
a collective term for sensory signals from the bodu
what is mechanoreception
term for detecting mechanical pressure/ distortion
what is proprioception
term for perception of body position by kinesthetic and vestibular receptors
what is noicepetion
pain perception
what is thermoception
temperature perception
what are the three attributes of a touch receptor
type of sstimulation receptor responds to
size of receptive field
rate of adaptation
where are touch receptors located
on outer layer- epidermis and underlayer - dermic
what are the four types of mechanoreceptors and what to they sense
meissner corpuscles -touch
merkel disks-touch
ruffinis endings- pressure
pacinian corpuscles- pressure
what are the three factors that mechanoreceptors can be categorised by
type of stimulation
size of receptive field
rate of adaptation
what is the name for fast adaptation
transient
describe merkel discs
slow adapting 1
small receptive field
respond best to steady downward pressure and low frequency vibrations
describe ruffinis endings
slow adapting 2
large receptive field
respond to sustained pressures
describe mesinner corpuscles
fast adapting 1
small receptive field
responds to vibrations between 5-50hz
describe pacinian corpuscles
fast adapting 2
large receptive field
respond to vibrations between 50-700 h
describe the work of mechanoreceptors in putting a key in a door
SA1 receptor anables feeling shape of key
SA 2 receptor enables shaping fingers to grasp key
FA1 enables increasing grip force if key is slippin from grasp
FA2 tells you when key hits end of keyhole
what are kinesthetic receptors
play role in sense of where limbs are and what kind of movements are made
what are three types of kinesthetic receptors
spindles receptors in tendons and receptors in joints
describe spindles
convey rate at which muscle fibres are changing in length
describe receptors in tendons
provide signals about tnesion in muscles attached to tendons
describe receptors in joints
reacts when joint is bent to an extreme angle
what are the two populations of thermoreceptors
warmth fibres and cold fibres
how does information reach the brain
peripheral nerves
how are faster processes enabled
mediated reflex
describe monosynaptic reflex
knee jerk
mediated by single connection
useful for protecting muscles from forces
not under conscious control
describe polysynaptic reflex
pulling away from fire
mediated by interneuron
consciously controlled
what are the 5 primary somatosensory receiving brain areas
central sulcus S1 areas 5 and 7 lateral sulcus S2
what is penfields map
he mapped somatosensory cortex
what is nociception
transmits info about things rhat cause damage or potential damage to skin
whats faster; mechanoreceptors and nociceptors
mechanoreceptors