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Ascending somatosensory > Lateral Spinothalamic tract > Flashcards

Lateral Spinothalamic tract Flashcards

1
Q

The sensory modalities of pain, temperature and non-discrimative touch for the body are carried over why system?

A

Anterolateral system or

Spinothalamic System

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2
Q

What are the two primary pathways of the Anterolateral system?

A

1.) Lateral spinothalamic pathway

2.) Anterior spinothalamic pathway

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3
Q

Sensory modalities for the antiero 2/3 of the head, face, oral and nasal cavities utilize what nerve when dealing with pain and non-discriminative touch?

A

The trigeminal nerve

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4
Q

What sensation is carried by the latearl spinothalamic system?

A

Pain and Temperature

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5
Q

The sensation of pain affiliated with the Lateral Spinothalamic Pathway is considered what?

A

Very pervasive and personal

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6
Q

The lateral spinothalamic pathway is named in essence of what?

A

the position of the fiber bundle of axons from the second neuron of the three-neuron chain

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7
Q

In the Lateral Spinothalamic Pathway the first order neuron is a _______ neuron with its cell body located where?

A
  1. ) Pseudounipolar neuron
  2. ) Dorsal Root Ganglia
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8
Q

The peripheral receptors for the Lateral Spinothalamic Pathway are what fiber type?

A

Free Nerve Endings (non encapsulated)

—A-delta fibers

–Lightly myelinated

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9
Q

A delta fibers of the Lateral Spinothalamic Pathway carry the sensation of what type of pain? Is it localizable or non-localizable?

A

Pricking pain that is fairly localizable

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10
Q

The central processes enter the spinal cord where (medially/laterally) and bifurcate where?

A

Laterally

Bifurcate in the Lissauer’s tract

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11
Q

After entering the dorsal horn the Lateral Spinothalamic Pathway involves a synapse where?

A

On neurons in substantia gelatinosa/nucleus proprius

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12
Q

What is the neurotransmitter affiliated with the synapse on neurons in substantia gelatinosa/nucleus proprius?

A

Glutamate

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13
Q

Where is the exact positin of the cell body for the second-order neuron in the Lateral Spinothalamic Pathway?

A

Most likely in substantia gelatinosa

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14
Q

Where so second order neurons sen their axons?

A

Across the midline through the anterior white commisure

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15
Q

Second order neuron axons enter through the anterior white commisure in what fashion?

A

An ascending and oblique (1-2 segements) direction

—this is what forms the Lateral spinothalamic tract on the contralateral side of the cord

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16
Q

The more laterally placed fibers in the lateral spinothalmic tract carry what type of sensation?

A

Pain and temperature sensations fomr the lower body

17
Q

The more medially placed fibers in the lateral spinothalmic tract carry what type of sensation?

A

Pain and temperature sensations from the UE

18
Q

The Lateral spinothalamic tract ascends through the spinal cord and brain stem to reach what?

A

Ventral posterolatearl thalamic nucleus (VPL) and intra-laminar thalamic nuclei

19
Q

Where is the third nueorn cell body located?

A

Ventral Posterolateral Thalamic nucleus (VPL)

20
Q

Somatotopic distribution of the latearl Spinothalamic pathway is maintained wihtin the nucleus of what?

A

The VPL

21
Q

In the nucleus of the VPL information concerning pain from the LE (lumbar-sacral dermatomes) are located where?

A

Laterally

22
Q

Axons of third order neurons leave the VPL and ascend where?

A

The Primary somatosensory cortex via the superior thalamic radiations

23
Q

The superior thalamic radiations is located where?

A

The medial part of the posterior limb of the internal capsule

24
Q

Primary somatosensory cortex is located where in the postcentral gyrus?

A

Cortical areas, 3, 1, 2

25
Q

Loss of 3rd order neurons wil result in what?

A

Loss of localization of pain, but not the affective emotional response to pain

26
Q

The Homunculus is upside down, making LE information represented where? What about trunk, and head/neck?

A

LE: At the midline, paracentral lobubule

Trunk: more laterally

Head/Neck: towards the lateral sulcus

27
Q

The homunculus allows for waht?

A

Precise localization of prickling pain (burning pain is less localized)

28
Q

Precision of this system makes it useful to define what?

A

Spinal cord Lesion sites

–identified by the loss of painful stimulation

29
Q

In regards to this system What makes it possible to idenify the level of a spinal cord lesion?

A

The fact that sensations cross in a relatively segmental manner

30
Q

Loss of pain all over the body is termed? Half the body?

A

Anesthesia

—hemi-anesthesia

31
Q

Technically speaking the Lateral Spinothalamic tract is from what point to what point?

A

Substantia gelatinosa/nucleus proprius to VPL

Ascending somatosensory (9 decks)

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