Facial and trigeminal nerve reflexes Flashcards

1
Q

2 tests to evaluate the trigemial nerve

A
  1. blink reflex
  2. trigemino-trigeminal reflex testing
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2
Q

2 tests to evaluate facial nerve

A
  1. blink reflex
  2. Direct facial nerve stimulation
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3
Q

3 clinical usefulness of these tests

A
  1. Px for recovery with idiopathic facial paralysis
  2. Differentiating between central vs peripheral nerve dysfunction
  3. assessing presence and extent of brainstem Lx in dogs with multifocal CN deficits
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4
Q

What is the blink reflex :)

A

stimulation of the trigeminal or facial branches –> reflex contraction of the ipsilateral orbicularis oculi muscle

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5
Q

blink reflex

What nerve branches can be stimulated in the blink reflex

A

Trigemial:
- infraorbital
- supraorbital (frontal)
- ZygomatIic

Facial
- Internal auricular

slide 9

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6
Q

blink reflex

What type of waveform is recorded

A

Reflex Evoked Muscle Potential (REMP)

(obtained by stimulating the facial or trigeminal branches and record in the orbicularis oculi muscles)

slide 16

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7
Q

Blink reflex

Describe R1

A

R1:
Trigeminal nerve branch –>
pontine sensory nucleus of V –>
Motor nucleus of VII
Facial nerve branch -> ipsi orbicularis oculi muscles

slide 11

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8
Q

Blink reflex

Describe R2

A

R2:
Trigeminal nerve branch –>
Spinal tract of V –> nucelus of spinal tract of V –>
to bilateral motor nuclei of VII –> bilateral orbicularis oculi muscles

Essential to distinguish afferent (V) vs efferent (VII) arc involvement (analogy to D+ and C+ PLRs)

slide 12

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9
Q

Describe R3

A

When specifically stimulating small-diameter, high-threshold afferent unmyelinated fibers

Trigeminal nerve branch (small) -> spinal tract of V -> nucleus of spinal tract of V -> ipsi motor nucleus of VII

slide 13

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10
Q

Blink reflex

understand interpretation based on lesions slide 19-23

A
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11
Q

Direct facial nerve stimulation

A
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