Science Quiz / chapter 8

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

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