Science Quiz / chapter 8

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

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