CN VII Flashcards
The CN VII UMN only receives ____ input from one side. Where do these fibers go?
- only receives crossed input from one side
- goes to the lower face
The CN VII LMN receives input from ____ sides. Where do these fibers go?
- receives crossed and ipsilateral input
- fibers go to entire one side of face
An UMN lesion on the left side leads to what?
Right side lower facial hemiplegia (opposite of lesion)
A LMN lesion on the left sides leads to what?
Left side upper and lower facial hemiplegia (same side of lesion)
If a patient presents with a lateral gaze paresis, facial palsy and loss of taste in anterior 2/3 or tongue, where does the lesion localize to?
Pons
- CN VI and VII are affected
If patient has a CN VII palsy , decreased tearing and hyperacusis, where does the lesion localize to?
Cerebellopontine angle tumor
Ramsey-Hunt syndrome (Geniculate Ganglionitis) can cause a Cn VII palsy. What’s the cause of this disease?
Herpes zoster vesicles attacking the geniculate ganglion
In a bell’s palsy, pain around the jaw or behind ear precedes facial droop by how many hours?
24-48 hrs
If Bell’s Palsy is idiopathic, what % of untreated patients will approve in 3 weeks?
85%
What is the examiner’s main job when tx bell’s palsy?
- Protect the cornea
- Oral Prednisone for 5 days, tapered within 14 days
Aberrant regeneration of CN VII can cause synkinesis. What is this?
- Facial contracture with every blink
- slight elevation of corner of the mouth with each blink
What is it called when a patient sees food and they begin to tear?
Crocodile Tears = Gustolacrimal Reflex (type of CN VII aberrant regeneration)
This is an idiopathic, unilateral or bilateral episodic, involuntary contraction of the orbicular oculi.
Essential Blepharospasm
What is Meige Syndrome?
When the orbularis oculi (eye) and orbicularis oris (mouth) closes involuntarily
This is a rhthymic, involuntary, intermittent unilateral facial twitching.
Hemifacial spasm
