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OTDV 528 > Sensory System & Lesions > Flashcards

Sensory System & Lesions Flashcards

1
Q

Somatosensory pathways carry this information and it can be divided into

A
  • direct pathways
  • indirect pathways
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2
Q

what pathway is somatotopically organized as a sensory discriminative function

A

direct pathways

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3
Q

which pathway projects to the somatosensory cortex on the contralateral side

A

direct pathways

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4
Q

which pathways is useful for diagnostically or localization of nervous system lesions

A

direct

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5
Q

___ pathway projects more diffusely with multiple synapses in the CNS

A

indirect pathways

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6
Q

___ pathway serves an affective arousal function (particularly pain) and project to the limbic cortices

A

indirect pathways

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7
Q

Cutaneous tactile receptors are located in glabrous and hairy skin are considered what

A

Sensory receptors

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8
Q

typically low-threshold ____ and may be encapsulated or unencapsulated

A

mechanoreceptors

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9
Q

example of a mechanoreceptors encapsulated

A

Meissner and Pacinian corpuscles

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10
Q

example of a mechanoreceptors unencapsulated

A

Merkel cell

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11
Q

what is located in the dermis, fascia around muscles and bone and in the periodontium

A

Deep tactile receptors

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12
Q

Ruffini endings and other specialized encapsulated receptors respond to what?

A

pressure, vibration, stretch, distension or tooth displacement

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13
Q

deep somatic tissues are innervated by

A

nociceptive afferents

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14
Q

Proprioceptive receptors include what

A

muscle spindles and golgi tendon organs

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15
Q

is formed by all of the receptors that can influence the activity of a single sensory (DRG) neuron

A

Receptor fields

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16
Q

fingers are considered what kind of receptor field?

A

Small fields

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17
Q

body surface is considered what kind of receptor field?

A

Larger fields

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18
Q

Primary pathways for conscious somatic sensation

A

Anterolateral system & Dorsal column-medial lemniscal system (DCML)

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19
Q

Crude touch, pain, and temperature

A

Anterolateral system

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20
Q

Carry these sensations into the lateral and anterior funiculi of the spinal cord

A

Anterolateral system

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21
Q

what is one of the reasons that some aspects of pain are well localized

A

somatotopically organized reaches primary somatosensory cortex in a highly organized and somatotopic fashion

22
Q

Discriminative touch, vibration, and joint position sense

A

Dorsal column-medial lemniscal system (DCML)

23
Q

Receptive field position and modality are segregated in the

A

dorsal column nuclei (topographically)

24
Q

information carried in what tract is somatotopically organized

A

Medial Lemniscus

25
Q

one way the brain can keep track of information for sensory origin/position is through what?

A

Medial Lemniscus

26
Q

what pathway receives and processes all somatic sensory information destined for cerebral cortex

A

Medial Lemniscus to the thalamus

27
Q

Medial Lemniscus to the thalamus processes almost all special sensory information except?

A

olfaction

28
Q

what carries:
- proprioception (knowing where body parts are in space without looking)
- two point discriminative touch
- vibration sense

A

Dorsal columns

29
Q

what are the 2 primary subdivision in the dorsal columns

A

medial fasciculus gracilis & lateral fasciculus cutaneou

30
Q

axons of DRGs below T6 and carries information originating from the leg

A

medial fasciculus gracilis

31
Q

axons from dermatomes above T6 and includes the arms and hands

A

lateral fasciculus cutaneou

32
Q

sensory, but unconscious & motor related

A

spinocerebellar system

33
Q

due yo sensory tract organization a lesions in cerebral cortex will produce sensory deficits on the….

A

opposite side of the body from the cerebral hemisphere

34
Q

leg lateral, arm medial

A

Anterolateral system = ALS

35
Q

arm lateral , leg medial

A

Dorsal columns = DC

36
Q

Leg lateral, arm medial is controlled by what structute?

A

Thalamus

37
Q
  • Arm lateral, leg medial
  • Sensory homunculus
  • Disproportionate representation
A

Primary somatosensory cortex

38
Q

thin sheet of neurons covering core thalamic nuclei anteriorly, dorsolaterally, and ventrolaterally

A

Reticular Nucleus

38
Q

thin sheet of neurons covering core thalamic nuclei anteriorly, dorsolaterally, and ventrolaterally

A

Reticular Nucleus

39
Q

whats important for sensory discrimination

A

primary somatosensory cortex

40
Q

what contains a bilateral somatotopic body map

A

Secondary somatosensory cortex (SII)

41
Q

what is important for tactile discrimination and transference of learned discrimination tasks from one hand to the other

A

Secondary somatosensory cortex (SII)

42
Q

Parietal cortical regions also receive tactile inputs, including areas

A

5 & 7

43
Q

areas 5 & 7 are associated with what

A

sensory-motor inter-relationships (primary projections to premotor cortex for motor planning)

44
Q

an ipsilateral cranial nerve dysfunction & contralateral sensory and/or motor deficit of the body is a

A

Unilateral brainstem lesions

45
Q

multiple sensory deficits in both systems since there is a convergence of sensory systems here is a lesion in the

A

thalamic nuclei or in close proximity to the thalamus

46
Q

Sensory deficits is contralateral and usually incomplete with some return of sensation over time is a lesion where?

A

Thalamic

47
Q

what lesion usually causes accompanying motor deficits

A

Posterior limb lesion

48
Q

when you can’t identify objects

A

astereognosis

49
Q

can result from a loss of the detection of sensation at a conscious level and/or the interpretation of sensory data received

A

astereognosis

50
Q

loss of texture & shape discrimination will produce the inability to identify an object placed in the hand without looking at it is what?

A

astereognosis

OTDV 528 (11 decks)

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