Science Quiz / chapter 8

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

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Created Nov 15, 2009ReportNominate

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