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Neuro Test 1 > Lecture 9 > Flashcards

Lecture 9 Flashcards

1
Q

What nuclei is the 1st Rexed’s Laminae a part of?

A

Marginal layer nuclei

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2
Q

What nuclei is Rexed Laminae 2 a part of?

A

Substantia Gelatinosa

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3
Q

Which nuclei is the 3rd and 4th Rexed Laminae a part of?

A

Nucleus Proprius

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4
Q

Which Rexed Laminae is a part of the Clarke’s nucleus?

A

7

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5
Q

What nuclei is Rexed’s laminae IX a part of?

A

Motor Nuclei

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6
Q

Which Rexed’s Laminae does proprioception

A

3 and 4

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7
Q

Which Rexed Laminae does noxious stimuli

A

1 and 2

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8
Q

What layer of meninges does the CSF circulate between?

A

Subarachnoid

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9
Q

With flexion of the spine, the SC stretches __% wereas the cauda equina ____

A

Spinal Cord stretches 10%

Cauda Equina stretches very little

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10
Q

What tract is the only one which doesn’t get it’s signals modulated by the spinalcord, and instead ascends all the way to the medulla before synapsing

A

Dorsal Column

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11
Q

How does the Jendrassik maneuver alter the DTR

A

Decreases inhibition going down the spinal cord

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12
Q

What is the purpose of central pattern generator

A

Rhythmic motor patterns

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13
Q

With complete transection of spinal cord, the Stepping pattern generator (Central pathway generator) can only be activated by ____________

A

Artificial means

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14
Q

What is the crossed extension reflex?

A

Withdraw reflex of one leg will ilicit the opposite LE to extend and catch yourself before you fall

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15
Q

What is a Renshaw cell?

A

Inhibitory interneuron who inhibits agonist and disihibits antagonist to promote fine motor control

Opposite of a muscle spindle!

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16
Q

segmental vs vertical tract impairment

A

segmental - show dermatomal/myotomal pattern

vertical pattern- everything below the level of that lesion (ipsilateral or contralateral depending on the tract)

17
Q

Reflexive bladder function requires what spinal levels?

A

Afferents: T11-L2 + S2-S4 cord levels

18
Q

The frontal cortex inhibits the _____ from telling sacral urination center to empty

A

Pons

19
Q

If the situation is appropriate the ______ disinhibits the ___ which will then signals to the sacral cord center to contract bladder walls

A

Frontal cortex disinhibits the pons

20
Q

The sacral cord center signals _______ (parasympathetic or sympathetic) neurons to contract the bladder wall and relax the sphincter

A

Parasympathetic

21
Q

Though the pons does not inhibit the bladder wall, it does send inhibitory signals to the __________

A

Alpha motor neurons of the external sphincter and pelvic floor muscles

22
Q

Bladder filling is involuntary with _______ (sympathetic or parasympathetic) fibers telling the bladder wall to relax and the internal sphincter to contract

A

sympathetic

Parasympathetic does the opposite (Contracts bladder wall and relaxed sphincter)

23
Q

How is the walking Stepping Pattern Generator normally activated?

A

Brain sends signal down spinal cord to let it know to start walking

24
Q

For sexual function, Psychogenic processes are mediated by what spinal levels?

A

Psychogenic (thoughts) L1-L2

Reflexogenic (sensory) S2-S4

Nerve fibers that originate in L1-L2 with cell bodies in S2-S4 control orgasm

25
Q

Where are the reflexogenic (sensory) fibers responsible for sexual function located

A

Psychogenic (thoughts) L1-L2

Reflexogenic (sensory) S2-S4

Nerve fibers that originate in L1-L2 with cell bodies in S2-S4 control orgasm

26
Q

What is the location of sympathetic nerve fibers responsible for orgasm

A

Psychogenic (thoughts) L1-L2

Reflexogenic (sensory) S2-S4

Nerve fibers that originate in L1-L2 with cell bodies in S2-S4 control orgasm + pudendal nerve

27
Q

What is Brown-Sequard syndrome

A

Exactly 1 half of the spinal cord is cut.

It manifests with weakness or paralysis and proprioceptive deficits on the side of the body ipsilateral (motor tracts+dorsal column) to the lesion and loss of pain and temperature sensation on the contralateral side (anteriolateral).

28
Q

In Brown-Sequard syndrome, the dorsal column senses are affected (contralaterally/ipsilaterally)

Whereas the anteriolateral cord senses are effected (contralaterally/ipsilaterally)

A

Dorsal- Ipsilateral (note motor tracts are ipsilateral too)

Anteriolateral - Contralateral (Because this tract crosses immediately in the spinal cord)

29
Q

How does anterior cord syndrome usually present?

A

Motor, Nociceptive, Temperature Impairments

30
Q

What functions are typically preserved in anterior cord syndrome?

A

Proprioception and light touch

31
Q

How and where does central cord syndrome usually occur?

A

Usually seen at cervical level following trauma

Neuro Test 1 (19 decks)

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