quiz 1

Question 1

List 8 sensations

Answer 1

touch
pressure
vibration
limb position
heat
cold
itch
pain

Question 2

Information in skin and muscles from receptors goes where

Answer 2

central nervous system (CNS)

Question 3

Is the somatosensory system specialized?
a) True
b) False

Answer 3

a) true

Question 4

Cutaneous Mechanoreceptors

Answer 4

fine touch
vibration
pressure

Question 5

Proprioception

Answer 5

the ability to sense the position of our own limbs and other body parts in space

Question 6

Free Nerve Endings

Answer 6

pain
temperature
coarse touch

Question 7

Dermatome

Answer 7

areas of skin on your body that rely on specific nerve connections on your spine

Question 8

Ia, Ib, II afferents

Answer 8

largest and fastest, supply sensory receptors to muscles for proprioception

Question 9

Aβ afferents

Answer 9

smaller, convey touch

Question 10

Aδ and C afferents

Answer 10

small and slow, pain and temperature

Question 11

Sensory Function: Proprioception

Answer 11

receptor type: muscle spindle
afferent: Ia, II

Question 12

Sensory Function: Touch

Answer 12

receptor type: merkel, meissner,pacinian, ruffini
afferent: Aβ

Question 13

Sensory Function: Pain and Temperature

Answer 13

receptor type: free nerve endings
afferent: Aβ

Question 14

Sensory Function: Pain, Temperature, and Itch

Answer 14

receptor type: free nerve endings (unmyelinated)
afferent: C

Question 15

Receptive FIelds

Answer 15

the area of the skin surface over which stimulation results in a significant change in the rate of action potentials

Question 16

Slowly Adapting Afferents

Answer 16

generate sustained discharge during ongoing stimulus
provide spatial info: size and shape of stimulus

Question 17

Rapidly Adapting Afferents

Answer 17

fire rapidly when a stimulus is first presented
fall silent with continual stimulation
convey changes (stimulus movement)

Question 18

Epidermis Region

Answer 18

pain
motion detection & grip
shape & texture

Question 19

Dermis Region

Answer 19

force, shape & internally generated motion

Question 20

Subcutaneous Region

Answer 20

vibrations

Question 21

Small Receptor Fields

Answer 21

merkel
meissner

Question 22

Large Receptor Fields

Answer 22

pacinian
ruffini

Question 23

Merkel

Answer 23

25% of mechanoreceptors in the hand
mainly in fingertips
highest spatial resolution of all sensory afferents

Question 24

Meissner

Answer 24

40% of the mechanoreceptors in the hand
closest to the skin surface
textured objects that move across the skin

Question 25

Pacinian

Answer 25

10-15% of the mechanoreceptors in the hand
detect vibrations transmitted through held objects
skilled use of tools (using a wrench, writing, cutting bread with a knife)

Question 26

Ruffini

Answer 26

20% of the mechanoreceptors in the hand
sense skin stretching, movement, and finger position
least understood
internally generated stimuli: movement of fingers

Question 27

Muscle Spindle

Answer 27

signal changes in muscle length

Question 28

Primary Ending (Ia)

Answer 28

largest myelinated axons rapidly respond to changes in muscle length
transmits information on limb position and direction of movement

Question 29

Secondary Endings (II)

Answer 29

produce sustained responses to static position of muscle length

Question 30

Golgi Tendon Organs

Answer 30

signal change in muscle tension

Question 31

Joint Receptors

Answer 31

relay finger position for range of motion

Question 32

Central Pathway: Tactile from Body