Lecture 23

Question 1

2 laws

Answer 1

law of specific nerve energy: eg. rub eyes, flash of light
law of projection: eg. Penfield, somatosensory cortex, touch on foot; phantom limb after amputation

Question 1

modality def

Answer 1

general class of a stimulus

Question 2

process

Answer 2

stimulus energy, receptor membrane, transduction, ion channel activation, afferent send to CNS

Question 3

transduction

Answer 3

stimulus E convert to opening or closing of ion channel

Question 4

receptive field

Answer 4

region in space that activate a sensory receptor or a neuron
overlapping produce population code

Question 5

acuity

Answer 5

ability to differentiate 1 stimulus from another
lateral inhibition sharpen sensory acuity
descending pathway modulate sensory input: eg. pain

Question 6

4 superficial layers

Answer 6

Meissner’s corpuscle, rapid, light stroke and fluttering
Merkel disk, slow, pressure and texture
Pacinian corpuscle, rapid, strong vibration
Ruffini ending, slow, stretch and bending of skin, shape of object

Question 7

pain

Answer 7

nociceptor, free nerve endings containing ion channel that open in response to intense mechanical deformation, excessive T or chemical
highly modulated afferent
visceral pain receptor activated by inflammation

Question 8

T

Answer 8

thermo receptor, free nerve endings containing ion channel that respond to different T range

Question 9

how ion channel function

Answer 9

membrane deform, put P, pull cytoskeletal strand, pull open ion channel