Touch

Question 1

4 modalities of somatic sensation

Answer 1

Tactile
Thermal
Pain
Proprioception

Question 2

Large, myelinated A fibers mediate sensations of :

Answer 2

Touch
Pressure
Vibration

Question 3

Small, unmyelinated C fibers mediate sensations of :

Answer 3

Itch

Tickle

Question 4

2 types of touch:

Answer 4

Crude

Fine

Question 5

Crude touch provides stimulus of :

Answer 5

Contact

Question 6

Fine touch provides stimulus of :

Answer 6

Exact information:
Location
Shape
Size 
Texture

Question 7

2 mechanoreceptors in superficial skin:

Answer 7

Meissner’s corpuscle

Merkel disk

Question 8

Meissners corpuscle are (RAPIDLY/ SLOWLY) adapting?

Answer 8

Rapidly adapting

Question 9

Merkel disks are (RAPIDLY/ SLOWLY) adapting

Answer 9

Slow adapting

Question 10

2 mechanoreceptors in deep subcutaneous tissue?

Answer 10

Pacinian corpuscle

Ruffini ending

Question 11

Meissner’s corpuscle is a ___ corpuscle whose receptors are surrounded by ___ cells

Answer 11

Tactile

Schwann cells

Question 12

Pacinian corpuscle is a ___ corpuscle and sense?

Answer 12

Lamellated

Vibration

Question 13

Ruffini endings respond to deep and continuous?

Answer 13

Pressure

Question 14

Free nerve endings that wrap around hair follicles:

…..instead of ____

Answer 14

Hair follicle receptors

Meissner corpuscle

Question 15

2 types of receptors in hairy skin:

Answer 15

Hair follicle receptors

Field receptors

Question 16

2 point threshold is the ___ distance between 2 detectable stimuli

Answer 16

Minimum

Question 17

Slow adapting mechanoreceptors continue to ___ to a stimulus and require ___ pressure

Answer 17

Respond

Steady pressure

Question 18

Rapidly adapting receptors respond to the __ and __ of stimulation

Answer 18

Onset

Offset

Question 19

Most important receptors for pressure:

Answer 19

Pacinian

Ruffini

Question 20

Vibration is determined by what 2 sensors?

Answer 20

Meissner

Pacinian

Question 21

All sensory neurons are ___ sensory with nuclei in___

Answer 21

First-order sensory

Dorsal root ganglion

Question 22

3 types of primary sensory fibers:

Answer 22

A-beta
A-delta
C fibers

Question 23

A-beta fibers detect:

Answer 23

Fine touch
Pressure
Proprioception

Question 24

A-delta fibers are mechanical nociceptors that detect:

Answer 24

Crude touch
Cold
Fast/ sharp pain

Question 25

C-fibers are polymodal nociceptors that detect:

Answer 25

Temperature | Slow/ dull pain

Question 26

The gray mater of the spinal cord is divided into 3 functional regions:

Answer 26

Dorsal horn Intermediate zone Ventral horn

Question 27

Histological laminae I-VI correspond to what functional area?

Answer 27

Dorsal horn

Question 28

Histologic laminae VII is roughly equivalent to ___ zone

Answer 28

Intermediate

Question 29

Histological laminae XIII ands IX comprise ___ horn

Answer 29

Ventral

Question 30

Histological lamina X is gray matter surrounding what structure?

Answer 30

Central canal

Question 31

2 pathways to brain:

Answer 31

DC/ML | Anterolateral system

Question 32

DC/ ML=

Answer 32

Dorsal column/ medial lemniscus

Question 33

DC/ML is the pathway for perception of :

Answer 33

Touch and proprioception

Question 34

DC/ML is formed by ___ cuneatus, ___ fasicuslus, and ____ lemniscus

Answer 34

Fasciculus cuneatus Fasiculus Gracilis Medial lemniscus

Question 35

The anterolateral system mediates sensations of ___

Answer 35

Pain and temperature

Question 36

Anterolateral system has both ___ and ___ pathways to thalamus

Answer 36

Direct | Indirect

Question 37

ALS=

Answer 37

Anterolateral system

Question 38

ALS first-order sensory neurons have cell bodies in the ?

Answer 38

Dorsal root ganglion

Question 39

Laminae I = ___ zone

Answer 39

Marginal zone

Question 40

Laminae II=

Answer 40

Substantia gelatinosa

Question 41

Laminae IV=

Answer 41

Nucleus proprious

Question 42

Laminae V and VI=

Answer 42

Dorsal nucleus

Question 43

Lamina VII=

Answer 43

Intermediate zone

Question 44

3 major divions of somatosensory cortex: S-I= S-II= And __ areas 5,7

Answer 44

Primary Secondary Posterior parietal cortex

Question 45

Neurons of S-II project to ___ cortex and form ___ memory

Answer 45

Insular | Tactile

Question 46

Brodmann’s areas 5 and 7=___ cortex

Answer 46

Posterior parietal cortex

Question 47

Dominant modality of area 3a

Answer 47

Proprioception

Question 48

Dominant modality area 3b

Answer 48

Cutaneous mechanoreceptors

Question 49

Dominant modality of area 1

Answer 49

Rapidly adapting cutaneous receptors

Question 50

Dominant modality of area 2 is a ___ modality segment; processes ___ and ___ receptors

Answer 50

Weak Slow Rapid

Question 51

Dominant modality of are 2 is responsible for sensing the __- and ___ of objects

Answer 51

Size | Shape

Question 52

Dominant modality 1 and 2 represent ___ input form hand/ fingers

Answer 52

Convergent

Question 53

Dominant modality area 3b and 1 sense surface ___

Answer 53

Texture

Question 54

Layer IV of cortex receives input from :

Answer 54

Thalamus

Question 55

Layer VI of cortex projects to:

Answer 55

Thalamus

Question 56

Layer II and III project to other ___ regions

Answer 56

Cortical

Question 57

Layer V of cortex projects to ___ structures

Answer 57

Subcortical

Question 58

___ inhibition sharpens the representation of a puncture stimulus by limits spread of excitation of convergent chains

Answer 58

Feed-forward inhibition

Question 59

Winner-take-all strategy for strongest competing response best describes ___ inhibition.

Answer 59

Lateral

Question 60

2 point discrimination is caused by ___ inhibition which suppresses excitation of neurons between the points.

Answer 60

Lateral inhibition

Question 61

4 types of higher order somatosensory neurons (DOTS):

Answer 61

Direction Orientation Texture Shape

Question 62

Lesion of 3b causes deficits of discrimination of ___ and well as size and shape

Answer 62

Texture

Question 63

Lesion of area 1 causes deficit in the assessment of ___ of objects

Answer 63

Texture

Question 64

Lesion of area 2 alters ability to differentiate ___ and ___ of objects

Answer 64

Size | Shape

Question 65

Lesion of S-I results in deficit in ___ sense... serious motor deficit in ___ function

Answer 65

Position sense | Hand function

Question 66

Lesion in S-II cause severe impairment in discrimination both ___ and ___

Answer 66

Shape | Texture

Question 67

Lesion of posterior parity cortex can lead to sensorimotor abnormalities resulting in poor ___ coordination

Answer 67

Eye-hand