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CNS > [PHYSIO] MUSCLE TONE DISORDERS > Flashcards

[PHYSIO] MUSCLE TONE DISORDERS Flashcards

1
Q

Causes of hypotonia/flaccidity (6)

A

Neocerebellar lesion
Chorea
LMNL
Acute UMNL
Area 4 lesion
Increased Ca2+ levels

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2
Q

Decorticate rigidity is caused by lesion in

A

Upper midbrain
Above superior colliculus

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3
Q

Decerebrate rigidity is caused by lesion in?

A

lower midbrain (between superior colliculus & inferior colliculus)
Or
Upper pons

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4
Q

Decorticate rigidity severity

A

Moderate

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5
Q

Decerebrate rigidity severity

A

Marked‼️

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6
Q

Rubrospinal tract activity in decorticate rigidity

A

Intact

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7
Q

Rubrospinal tract activity in decerebrate rigidity

A

Decreased

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8
Q

Vestibulospinal tract activity in decorticate rigidity

A

Intact

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9
Q

Vestibulospinal tract activity in decerebrate rigidity

A

Intact

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10
Q

UL in decorticate rigidity

A

Flexed+adducted

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11
Q

LL+ head&neck in decorticate rigidity

A

Extended

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12
Q

UL in decerebrate rigidity

A

Extended

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13
Q

LL+ head&neck in decerebrate rigidity

A

Extended

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14
Q

Motor neuron activity in decorticate rigidity

A

Increased gamma motor neuron

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15
Q

Motor neuron activity in decerebrate rigidity

A

Increased alpha & gamma motor neuron activity

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16
Q

Spasticity definition

A

Initial resistance to passive movement followed by sudden release

17
Q

Rigidity definition

A

Sustained resistance all throughout movement

18
Q

Spasticity is caused by lesion in

19
Q

Rigidity is caused by lesion in

A

Substantia nigra

20
Q

Spinal motor neuron activity in spasticity

A

Increased gamma motor neuron activity

21
Q

Spinal motor neuron activity in rigidity

A

Increased alpha & gamma motor neuron activity
MAINLY ALPHA

22
Q

Affected muscles in spasticity

A

Antigravity muscles

23
Q

Affected muscles in rigidity?
Exception?
Mainly affected muscles?

A

All head and body muscles
Except= extraocular muscles
Mainly=Flexors

24
Q

Direction of resistance in spasticity

A

Unidirectional

25
Q

Direction of resistance in rigidity

A

Bidirectional

26
Q

Effect of velocity on spasticity

A

Velocity dependent

27
Q

Effect of velocity on rigidity

28
Q

Character of rigidity in spasticity

A

Clasp knife

29
Q

Character of rigidity in rigidity hypertonia

A

Cog wheel
Lead pipe

30
Q

Example of rigidity characterized by continuous resistance

31
Q

Example of rigidity characterized by interrupted resistance

32
Q

Deep reflexes in spasticity

A

Exaggerated
Hyperreflexia

33
Q

Deep reflexes in rigidity

A

Normo-reflexia

CNS (29 decks)

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