Science Quiz / chapter 8

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various stimulating intensities and receptor thresholds.
receptors found on C fibers (unmyelinated) detect temp drop and menthol
receives info of both sides of the body directly from S1
3 tracts of anterolateral system
sensory info is coded by # of APs per unit of time b/c APs are always the same size
receptor: free nerve endings in dermis that respond to chemical stimulation, mechanical damage, and temp that produce or may produce tissue damage.
Meissner’s corpuscle
region of “target” on skin that receives most info from thalamus.
Pacinian corpuscle
receptor: ion channels open to specific temps
has steady frequency of action potentials
Ruffini’s ending
ibuprofen/morphine/aspirin block nociception at the source.
decrease freq of action potentials as stimulus is maintained.
info from body (position, movements, pressure, pain, temp, vibration)
skin innervated by particular spinal root.
receives directly from primary. Outer region on “target” on skin
emotional response of pain in posterior cingulated, observed pain response in anterior cingulate
info from other parts of body invade unused area and activate unused pathways.
interconnected neurons inhibit neighbors to enhance perception of stimulus.
free nerve endings send axons to dorsal horn of spinal cord, spinal cord neurons send their axons across to opp side of spinal cord and up the anterolateral columns to the thalamus
stimulus region and features that cause max response of sensory receptor.
Merkel’s disc
selective awareness or perceptual receptivity.
senses have independent receptors and neural channels.
absence or reduction of pain.
receptor: pressure, stretch, vibration. Cell membrane is physically distorted and ion channels open.
Cortex tells thalamus to dampen some sensory info and amplify others.
progressive loss of receptor sensitivity
receives touch info from opp side of body. Behind central sulcus. Has 3 areas
3 Components of pain
each afferent nerve input reports particular type of info using a type of energy.
receptors found on Aδ fibers (myelinated) detect moderate heat and capsaicin
receptors found on C fibers (unmyelinated) detect high heat
electrical pulses through skin to excite nerves and the release of endogenous opiods to block afferent pain signal

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