week 4B Flashcards
what are 4 types of sensory receptores?
chemorec
mechanorec
thermorec
nocirecep
do we have more cold thermoreceptors or hot?
cold
what are the two types of fiberes in nocireceptors and what do each detect?
A fibers - sharp, localized pain
C fibres - dull, burning delaye dpain
what do A fibres detct
shar pain
what are 3 types of mechano recpetorea and what do each do?
tactil(cutaneous) mechanoreceptores - touch pressure, vibration (also pos maybe)
baroreceptors - changes in BP
propriovceptores - position of joints (eg msucle spindles)
sensory receptors carry info from. ___ to ___ while motor neruon carry infor form ___ to ____
from sensory organs to CNS
from CNS to msucles /glands
what sensory function has the fastest condiction velocity and what has the slowest?
fastes - proprioception - msucle spindles
sklowes = pain temp it h
the sensory function propriceptioin involces what receptor type? what afferent type/
msucle spindle - type Ia, II
what afferent axon type is involed in touch?
A beta
type C afferent types have the ____ aoxnd siameter and are involved in ___ sensory fucntion The
the smallets, pain, temep, itch
what is the receptor type asscoiated with pain and temp?
free nerve endings (unmyelinated0
what is the receptor tyep ascoite with touch?
merkel, meissner, pacinian, raffini
with mechanoreceptors singal can be modualted by wha t2 factos>
duration and strenght of stimuli
waht are the two types of cutaneous mechanoreceptirs
tonic and phasic
what is the differnece between tonic andphasic cutaneous machanoreepetors?
tonic - slowly adapts to continual adaption, inn by slowly adapted afferents
- doesnt like change, pen continously on skin - fires with cobnsitent stimuli
phasic- rapidly adapts to continual stimualtion, will not ocntinously fire but wil respond to changef
a neurons cutaneous receptive field is )___
he area of skin that, when stimulated,
produces or changes responses in the neuron
what is the receptive field of a sensoty enyrob?
the spatial extend of a recepto surface where the sensory neuron receives input
what is a hot spot?
its withing th ereeptive field, where the senesory neruons are most sensitive - acivate more aitonpotentials/relase more neutotransmitters
superficial receptors have ____ receptive fields with ____ hot spots
deep receptors have ____ recpeto fields wiht ___ hot spots
smalll receptive fields, lots of hotspots
alrge receptive fields, one hot spot
what is the differnce in hot spots in type 1 and 2 cutaneous receptors
type 1 (sueprfical) multiple hot spots - type 2 (deep). one htospot
what do pylysnpatic pathways allow iwht cutaneous receptors?
medoate flecsion and cross-etension refelceds
eg one arm pulls back from pain while the ther stbailies body on the colateral side
cross extension (colateral) + flexion (pull away)
What are the differences between slowly and rapidly adapting sensory afferents?
Slowly adapt to continual situation and consistent stimuli and do not like change
Rapid adapting respond to changes, rapidly adapt to coninuoal changes and then reactiated when stimulus ends
Why might having varying firing properties be beneficial ?
We have different firing properties so that we can distinguish different things - eg if remote is slipping out of gand, remote buttons …
For sensory neurons, intensity of the signal is influenced by ___ and ___ of the stimuli
amplitude + durion
