Flashcards in W03_04_Somatosensation beyond the DC/ML Deck (15)
name 4 cortical sensory modalities
double simultaneous stimulation
name of the receptor that responds to sound, light, tissue damage, temp, touch, pressure?
name of receptor that monitors stimuli from viscera
definition of receptor threshold?
stimulus intensity required to activate the receptor 50% of the time
threshold levels for tactile sensation?
threshold levels for pain?
function of rapidly adapting receptors?
report the onset/end of a stimulus;
for hi-freq vibration, mvt of objects across skin
function of slowly adapting receptors?
report continuously on stimulus;
for pressure, shape, lo-freq vibration, intensity of stimulus
size of types of SS nerve fibres?
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)
how is sensation focused?
cortical descending inhibition;
lateral inhibition of unrelated interneurons;
these keep modalities separate
what are the 4 regions of the SI primary SS area?
2x integration for differentiating texture, size, shape, motion
what is the SII secondary SS area important for?
note that SII projects internally to the insula along the gyrus.
what are the inputs of SII area?
SI and thalamus;
outputs to temporal lobe via insula