Flashcards in W03_04_Somatosensation beyond the DC/ML Deck (15)
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1
name 4 cortical sensory modalities
graphesthesia,
stereognosis,
two-point discrimination,
double simultaneous stimulation
2
name of the receptor that responds to sound, light, tissue damage, temp, touch, pressure?
exteroceptor
3
name of receptor that monitors stimuli from viscera
enteroceptor
4
definition of receptor threshold?
stimulus intensity required to activate the receptor 50% of the time
5
threshold levels for tactile sensation?
low
6
threshold levels for pain?
high
7
function of rapidly adapting receptors?
report the onset/end of a stimulus;
for hi-freq vibration, mvt of objects across skin
8
function of slowly adapting receptors?
report continuously on stimulus;
for pressure, shape, lo-freq vibration, intensity of stimulus
9
size of types of SS nerve fibres?
Aalpha>Abeta>
Agamma>Adelta>
B>C
10
name 3 projections to other areas?
interneurons in dorsal horn (pain suppression);
medullary+pontine reticular formations (alerting responses and modifying locomotor reflexes);
superior colliculus (orienting reflexes)
11
how is sensation focused?
cortical descending inhibition;
lateral inhibition of unrelated interneurons;
these keep modalities separate
12
what are the 4 regions of the SI primary SS area?
cutaneous mechanoreceptors;
proprioceptors;
2x integration for differentiating texture, size, shape, motion
13
what is the SII secondary SS area important for?
tactile memory;
note that SII projects internally to the insula along the gyrus.
14
what are the inputs of SII area?
SI and thalamus;
outputs to temporal lobe via insula
15
