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501 Neuro > Somatosensory Pathyways > Flashcards

Somatosensory Pathyways Flashcards

1
Q

The somatosensory pathways include descending or ascending pathways?

A

Ascending pathways

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2
Q

What are the two tracts that are a part of the somatosensory pathway in the rostral, caudal midbrain, middle, caudal pons, and rostral medulla?

A

Medial lemniscus
Spinothalamic tract

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3
Q

What are the tracts and nuclei that are a part of the somatosensory pathway in the caudal medulla,

A

Ascending pathways: Gracile tract, cuneate tract, internal arcuate fibers, medial lemniscus, spinothalamic tract
Nuclei: gracile nucleus, cuneate nucleus

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4
Q

What tracts are part of the ascending pathway in the cervical spinal cord?

A

Gracile tract
Cuneate tract
Spinothalamic tract

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5
Q

What is the purpose of the posterior column-medial lemniscus pathway?

A

Carry peripheral information to the brain

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6
Q

What is the definition of somatosensory?

A

All sensations arising from the skin, connective tissue, voluntary muscles, periosteum and teeth

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7
Q

What are the touch sensations?

A

Discriminative touch
Pressure
Vibration
Conscious proprioception

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8
Q

There are 3 types of discriminative touch. What are they?

A

Two-point discrimination: telling 2 points apart
Stereognosis: ID objects via touch only
Graphesthesia: ID writing on skin by touch only

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9
Q

What are pain and temperature sensations?

A

Pain (nociception)
Temperature
Nondiscriminative touch

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10
Q

What is proprioception?

A

Conscious and nonconscious information from structures including muscle spindles and golgi tendon organs regarding position sense and movement
Ability to consciously know where body parts are, knowing about position sense and movement

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11
Q

Peripheral components: some somatosensory neurons are associated with ____ while others are ___ nerve endings

A

Receptors
Free nerve endings

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12
Q

What are the three categories of somatosensory receptors?

A

Mechanoreceptors (tactile sensation)
Pain receptors
Thermoreceptors

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13
Q

The posterior column-medial lemniscus pathway conveys which sensations

A

Discriminative touch
Conscious proprioception

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14
Q

The cuneate tract of the posterior column-medial lemniscus pathway is responsible for

A

Upper limb

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15
Q

The gracile tract of the posterior column-medial lemniscus pathway is responsible for

A

Lower limb

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16
Q

Posterior column-medial lemniscus pathway: first order neurons structure locations

A

Cell bodies: posterior root ganglia
Central processes: gracile tract (lower limb), cuneate tract (upper limb)

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17
Q

Posterior column-medial lemniscus pathway: second order neurons structure locations

A

Cell bodies: gracile and cuneate nuclei
Axons: medial lemniscus

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18
Q

Posterior column-medial lemniscus pathway: third order neurons structure locations

A

Cell bodies: VPL nucleus of thalamus
Axons: posterior limb of internal capsule

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19
Q

Vascular territories of PCML pathway: Spinal cord is supplied by

A

Posterior spinal artery

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20
Q

Vascular territories of PCML pathway: Medulla is supplied by

A

Anterior and posterior spinal artery

21
Q

Vascular territories of PCML pathway: Pons is supplied by

A

Paramedian artery (basilar)

22
Q

Vascular territories of PCML pathway: Midbrain is supplied by

A

Quadrigeminal artery
Posterior cerebral artery

23
Q

Spinothalamic (anterolateral) pathway conveys which sensations

A

Pain
Temperature
Nondiscriminative touch

24
Q

Spinothalamic pathway: First order neurons structure locations

A

Cell bodies: posterior root ganglia
Central processes: posterior roots

25
Q

Spinothalamic pathway: Second order neurons structure location

A

Cell bodies: posterior horn
Axons: anterior white commissure and spinothalamic tract

26
Q

Spinothalamic pathway: third order neurons structure location

A

Cell bodies: VPL nucleus of thalamus
Axons: posterior limb of internal capsule

27
Q

Vascular territories of the spinothalamic pathway: spinal cord supplied by

A

Anterior spinal artery

28
Q

Vascular territories of the spinothalamic pathway: medulla supplied by

A

Vertebral artery

29
Q

Vascular territories of the spinothalamic pathway: pons supplied by

A

ACA, long circumferential artery

30
Q

Vascular territories of the spinothalamic pathway: midbrain supplied by

A

PCA, quadrigeminal artery

31
Q

What part of the internal capsule is associated with the spinothalamic pathway

A

Posterior limbs
Axons from VPL of thalamus go through post limb of internal capsule to somatosensory cortex

32
Q

What is the somatosensory association cortex responsible for?

A

Higher level processing of sensory information

33
Q

Review of blood supply to cerebrum:
MCA supplies …
PCA supplies …
ACA supplies ….

A

MCA: lateral cerebral hemispheres
PCA: medial temporal and occipital lobes
ACA: medial frontal and parietal lobes

34
Q

Posterior column-medial lemniscus pathway is …

A

Touch pathway

35
Q

Spinothalamic pathway is ….

A

Pain and temperature pathway

36
Q

The cranial touch pathway conveys ….

A

Sensation for discriminative touch and conscious proprioception

37
Q

Information to the cranial touch pathway primarily comes from ….

A

Trigeminal nerve

38
Q

The cranial touch pathway is also called the ___ pathway

A

Trigeminal

39
Q

Cranial touch pathway: first order neurons structure location

A

Cell bodies: trigeminal ganglion
Central processes in trigeminal nerve

40
Q

Cranial touch pathway: second order neurons structure location

A

Cell bodies: principal sensory trigeminal nucleus
Axons: trigeminothalamic tract

41
Q

Cranial touch pathway: third order neurons structure location

A

Cell bodies: VPM nucleus of thalamus
Axons: posterior limb of internal capsule

42
Q

What sensations are conveyed by the cranial pain and temperature pathway?

A

Pain
Temperature
Non discriminative touch

43
Q

Damage of the cranial touch pathway at the level of the pons and above leads to

A

Loss of touch only

44
Q

Damage at the cranial touch/pain and temp pathway below the pons leads to

A

Loss of pain and temp

45
Q

Decussation occurs at the level of the ___ in the cranial touch and cranial pain and temp pathway

A

Medulla

46
Q

Cranial pain and temp pathway: first order neurons structure locations

A

Cell bodies: trigeminal ganglion
Central processes: CN V, spinal trigeminal tract

47
Q

Cranial pain and temp pathway: second order neurons location

A

Cell bodies: spinal trigeminal nucleus
Axons: trigeminothalmic tract

48
Q

Cranial pain and temp pathway: third order neuron structure location

A

Cell bodies: VPM nucleus of thalamus
Axons: posterior limb of internal capsule

49
Q

Where is the point of decussation of the cranial pain and temperature pathway?

A

Second order neuron

501 Neuro (16 decks)

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