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Ent > Facial Nerve > Flashcards

Facial Nerve Flashcards

1
Q

Facial Nerve is mixed/motor /sensory?

A

Mixed but mainly motor

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2
Q

Sensory part of facial nerve is aka

A

Nerve of wrisberg/Nerve of intermedius

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3
Q

Bony canal that covers facial nerve

A

Fallopian canal

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4
Q

Where is Fallopian canal shortest and narrowest?

A

Labyrinthine segment

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5
Q

Most common Site where viral infection lead to compression and ischemia of facial nerve

A

Labyrinthine segment

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6
Q

Landmarks for facial nerve on medial wall of middle ear

A

Processus cochleriformis
Oval window
Lateral SCC

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7
Q

Most common site of dehiscence of fallopian canal

A

Horizontal segment

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8
Q

Vertical segment is located on which wall

A

Posterior wall of middle ear

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9
Q

Landmarks to define vertical segment of facial nerve location

A

Pyramid
Fossa incudis
Chorda tympani
Aditus

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10
Q

1st branch of facial nerve is given off from

A

1st genu -GSPN

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11
Q

Second branch is given at

A

At the pyramid -nerve to stapedius

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12
Q

Branch given just above stylomastoid foramen

A

Chorda tympani

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13
Q

What happens if 1st branch of facial nerve is damaged

A

Dry eye

Schirmers test

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14
Q

What happens if second branch is injured

A

Loss of stapedial reflex

Hyperacusis

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15
Q

Function of chorda tympani

A

Taste and salivation

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16
Q

What are the topodiagnostic test done to know the site of lesions of facial nerve

A

Schirmers
Stapedial
Taste
Salivation

17
Q

Electrodiagnostic test will assess prognosis

What are the test done

A

ENG

EMG - fibrillation potential and action potential

18
Q

why should we wait 3 days before performing ENG

A

Wallerian Degeneration

19
Q

MC idiopathic facial nerve palsy

A

Bells palsy

20
Q

Viral cause of Bell’s palsy

A

HSV1

21
Q

Most common site for bells palsy

A

Labyrinthine segment

22
Q

Symptoms of pt with bells palsy

A

Dry eye
Hyperacusis
Lack of taste and salivation in ant 2/3
Lmn palsy of one side of face

23
Q

How to manage pt of bells palsy
Dose of steroid
And antiviral can be useful upto __ days

A 
No hospitalization
1 mg/ kg steroid
3 days antiviral 
Physiotherapy nerve stimulation
Eye care lubrication and padding
24
Q

Idiopathic facial nerve palsy
Swelling of lips
Fissures of tongue

A

Melkerson Rosenthal syndrome

25
Q

Infection of EAC leading to facial nerve palsy

A

Malignant otitis externa
Csom
Aom
Ramsay hunt syndrome due to herpes zoster

26
Q

Mcc traumatic cause of facial nerve palsy

A

Surgical

Parotid > Mastoid

27
Q

Which fracture of temporal bone is most common cause of f n palsy

A

Transverse fracture

28
Q

Best investigation for trauma to temporal bone

A

Hrct

29
Q

Important sign seen in temporal bone fracture

A

Battle sign

30
Q

After surgery of parotid gland sudden onset facial palsy occurs. How to manage?

A

Immediate exploration

31
Q

After surgery of parotid gland late onset facial palsy occurs. How to manage?

A

Steroids

32
Q

Graft for facial nerve
a ) most common
b) Long graft

A

a greater auricular C2C3

b) sural

33
Q

Aberrant regeneration can cause?

A

Synkinesis

Crocodile tears

34
Q

What are crocodile tears

Where is the site of injury

A

Tearing with salivation

Before the origin of gspn i e labyrinthine segment or cp angle

35
Q

What is frey syndrome

A

Gustatory sweating

36
Q

Cause of frey syndrome

A

Injury to auriculotemporal nerve in parotid surgery
Aberrant regeneration
Nerve fibers Supplies sweat gland overlying parotid

37
Q

Management of freys

A

Botox
Surgical - implantation below skin
Tympanic neurectomy

38
Q

Incision for parotid surgery

A

Lazy S incision aka modified blaires incision

Ent (5 decks)

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