Somatosensory receptors and reflexes

Question 1

Type of sensory axons that are faster and larger diameter

Answer 1

Large fibers - group I-II

Question 2

Type of sensory axons that convey info from muscles, touch, pressure

Answer 2

Large fibers - group I-II

Question 3

Type of sensory axons that are found in medial dorsal roots

Answer 3

Large fibers - group I-II

Question 4

Type of sensory axons that are slower with smaller diameter

Answer 4

Small fibers - group III-IV

Question 5

Type of sensory axons that convey info on pain and temperature

Answer 5

Small fibers - group III-IV

Question 6

Type of sensory axons that are found in lateral dorsal roots

Answer 6

Small fibers - group III-IV

Question 7

a graded potential produced by the sensory receptor, usually depolarizing AKA “generator potential”

Answer 7

receptor potential

Question 8

decline in responsiveness of sensory receptor even though stimulus still applied

Answer 8

Adaptation

Question 9

Type of mechanoreceptor that is rapidly adapting, vibration

Answer 9

Meissner’s corpuscles

Question 10

Type of mechanoreceptor that is slowly adapting, touch

Answer 10

Merkel’s discs

Question 11

Type of mechanoreceptor that is rapidly adapting, deep pressure and vibration

Answer 11

Pacinian corpuscles

Question 12

Type of mechanoreceptor that is slowly adapting, skin stretch at joints, touch, vibration

Answer 12

Ruffini’s corpuscles

Question 13

Are Meissner’s corpuscles rapidly or slowly adapting?

Answer 13

Rapidly

Question 14

Are Merkel’s discs rapidly or slowly adapting?

Answer 14

Slowly

Question 15

Are Paccinian corpuscles rapidly or slowly adapting?

Answer 15

Rapidly

Question 16

Are Ruffini’s corpuscles rapidly or slowly adapting?

Answer 16

Slowly

Question 17

Meissner’s corpuscles sense this type of stimulus

Answer 17

vibration

Question 18

Merkel’s discs sense this type of stimulus

Answer 18

Touch

Question 19

Pacinian corpuscles sense this type of stimulus

Answer 19

Deep pressure and vibration

Question 20

Ruffini’s corpuscles sense this type of stimulus

Answer 20

Skin stretch at joints, touch and vibration

Question 21

Nociception is relayed by these, that respond to mechanical damage or chemical released from damaged cells

Answer 21

Free nerve endings

Question 22

Does the CNS have pain receptors?

Answer 22

No

Question 23

Class of pain that is sharp and well localized

Answer 23

First pain

Question 24

Class of pain that involves type III Aδ fibers

Answer 24

First pain

Question 25

First pain involves this type of sensory fibers

Answer 25

Type III Aδ fibers

Question 26

Class of pain that is dull and poorly localized

Answer 26

Second pain

Question 27

Second pain has this type of sensory fibers

Answer 27

Type IV C fibers

Question 28

Class of pain with Type IV C fibers

Answer 28

Second pain

Question 29

heightened perception of painful stimulus following a previous painful stimulus, lowered threshold possibly due to inflammation

Answer 29

Hyperalgesia

Question 30

pain resulting from a stimulus that normally does not produce pain (e.g. touch to sunburned skin)

Answer 30

Allodynia

Question 31

sensory receptors embedded in muscle that detect changes in muscle length (stretch) and velocity

Answer 31

Muscle spindles

Question 32

In muscle spindles, sensory fibers wrap around these

Answer 32

Intrafusal fibers

Question 33

In muscle spindles, these are extrafusal fibers

Answer 33

Skeletal muscle fibers

Question 34

2 types of receptors in muscles spindles

Answer 34

Nuclear chain fibers (stretch) Nuclear bag fibers (speed)

Question 35

Type of receptor in muscle spindles that is involved in stretch

Answer 35

Nuclear chain fibers

Question 36

Type of receptor in muscle spindles that is involved in speed

Answer 36

Nuclear bag fibers

Question 37

In muscle spindles, stretch is conducted by these fibers, to activate alpha motor neurons that respond with contraction of extrafusal fibers to counteract the stretch

Answer 37

Group Ia fibers

Question 38

In muscle spindles, stretch is conducted by group Ia to activate these that respond with contraction of extrafusal fibers to counteract the stretch

Answer 38

Alpha motor neurons

Question 39

type of muscle receptor that respond to changes in muscle force

Answer 39

Golgi tendon organs

Question 40

Golgi tendon organs are innervated by this type of fiber

Answer 40

Group Ib fibers

Question 41

These receptors are activated when muscle contracts (opposite of stretch receptors) and inhibit the same muscle if too much force develops

Answer 41

Golgi tendon organs

Question 42

the sensation of limb position and movement relayed by muscle receptors

Answer 42

Proprioception

Question 43

Positive Babinski is a classic sign of this

Answer 43

Upper motor neuron lesion (typically indicates damage to motor cortex or corticospinal pathway)

Question 44

Babinski sign may be positive due to damage to this spinal tract

Answer 44

Corticospinal

Question 45

Somatic sensory cells project their axon peripherally as this

Answer 45

Spinal nerve

Question 46

Somatic sensory cells project their axon centrally through this

Answer 46

Spinal dorsal roots

Question 47

Do large fibers (group I-II) travel in the medial or lateral part of the dorsal root?

Answer 47

Medial

Question 48

Do small fibers (group III-IV) travel in the medial or lateral part of the dorsal root?

Answer 48

Lateral

Question 49

What part of the fiber dictates its conduction velocity?

Answer 49

Diameter

Question 50

This reflex is also known as the myotatic reflex, deep tendon reflex, or knee jerk

Answer 50

Stretch reflex

Question 51

Reflex that involves the contraction of the same muscle in response to stretch

Answer 51

Stretch reflex

Question 52

Do golgi tendon organs require gamma motor neurons?

Answer 52

No

Question 53

Together, these two types of muscle receptors and other somatic receptors convey the sense of proprioception

Answer 53

Muscle spindles and Golgi tendon organs

Question 54

Positive Babinski sign may be seen after damage to either of these

Answer 54

Corticospinal tract Motor cortex

Question 55

The stretch reflex is due to the activation of these receptors

Answer 55

Muscle spindles

Question 56

Type III Aδ fibers transmit first or second pain?

Answer 56

First

Question 57

Type IV C fibers transmit first or second pain?

Answer 57

Second