Science Quiz / chapter 8

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

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