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Disorders of facial nerve – II
and
Topodiagnostic tests
Mohammed Shafeeqe. P
Roll no:MB140022 1
Infections
• Herpes zoster oticus
• Acute suppurative otitis media
• Chronic suppurative otitis media
• Malignant otitis externa
2
Herpes zoster oticus (Ramsay-Hunt syndrome)
Caused by Varicella zoster virus
Pathogenesis
After initial infection, varicella zoster virus lies dormant in geniculate
ganglion.
When the immunity of the patient is suppressed, the virus is reactivated
and travels to the end of the nerve cell, where it causes the symptoms .
3
 Clinical features
 Sudden severe pain
 Facial paralysis
 Vesicular rash in the Ext. auditory canal, pinna, tongue and soft
palate.
 Taste loss in the front two-thirds of the tongue
 Dry mouth and eyes
 Involvement of Vth and VIIIth nerve in the form of anesthesia of face,
tinnitus, hearing loss, and vertigo.
Treatment
 Same as Bell palsy
 Anti virals e.g., Acyclovir
4
Trauma
• Fractures of temporal bone
• Iatrogenic (during surgery)
Ear or mastoid Sx
Parotid Sx
• Trauma to the face
5
Fractures of temporal bone
• Fractures can be transverse, longitudinal or mixed.
• Paralysis is due to intraneural haematoma, compression
by a bony spicule or transection of nerve.
Longitudinal fracture Transverse fracture
Less common (20%) More common (50%)
Delayed onset Immediate onset
Injury in tympanic segment Injury in meatal or labyrinthine segment
Managed conservatively as in Bell palsy Surgery is needed in the form of
decompression, re- anastamosis of cut
ends or cable nerve graft
6
Iatrogenic injury
• Facial nerve can be injured during
– stapedectomy,
– tympanoplasty
– mastoid sx
– Surgery of parotid tumors
• Deliberatively excised in malignant tumors
• Application of obstetrics forceps can result in facial paralysis in the neonate
due to pressure in the extrapyramidal part of the nerve.
7
Topodiagnostic tests
• Useful in finding the site of lesion
• Helps in establishing the etiology
• To find out the site of surgical decompression
• Various tests used are
Schirmer test
Stapedial reflex test
Taste test
Submandibular salivary flow test
8
Schirmer test
• Test for greater superficial petrosal nerve.
• Compares the lacrimation of two sides.
• A strip of filter paper is hooked in the lower fornix of each
eye and the amt of wetting is measured.
Stapedial reflex
• Tested by Impedence audiometry.
• It is a test for nerve to stapedius.
9
Taste test
• Measured by
A drop of salt or sugar is placed on one side of the protuded tongue
Electrogustometry
• It is a test for chordae tympani.
Submandibular salivary flow test
•Measures the function of chorda tympani.
•Polythene tubes are passed into both warton ducts and
drops of saliva counted during one minute period.
10
Fig. Topographic localization of facial nerve lesions
11
Thank you
12

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Facial nerve

  • 1. Disorders of facial nerve – II and Topodiagnostic tests Mohammed Shafeeqe. P Roll no:MB140022 1
  • 2. Infections • Herpes zoster oticus • Acute suppurative otitis media • Chronic suppurative otitis media • Malignant otitis externa 2
  • 3. Herpes zoster oticus (Ramsay-Hunt syndrome) Caused by Varicella zoster virus Pathogenesis After initial infection, varicella zoster virus lies dormant in geniculate ganglion. When the immunity of the patient is suppressed, the virus is reactivated and travels to the end of the nerve cell, where it causes the symptoms . 3
  • 4.  Clinical features  Sudden severe pain  Facial paralysis  Vesicular rash in the Ext. auditory canal, pinna, tongue and soft palate.  Taste loss in the front two-thirds of the tongue  Dry mouth and eyes  Involvement of Vth and VIIIth nerve in the form of anesthesia of face, tinnitus, hearing loss, and vertigo. Treatment  Same as Bell palsy  Anti virals e.g., Acyclovir 4
  • 5. Trauma • Fractures of temporal bone • Iatrogenic (during surgery) Ear or mastoid Sx Parotid Sx • Trauma to the face 5
  • 6. Fractures of temporal bone • Fractures can be transverse, longitudinal or mixed. • Paralysis is due to intraneural haematoma, compression by a bony spicule or transection of nerve. Longitudinal fracture Transverse fracture Less common (20%) More common (50%) Delayed onset Immediate onset Injury in tympanic segment Injury in meatal or labyrinthine segment Managed conservatively as in Bell palsy Surgery is needed in the form of decompression, re- anastamosis of cut ends or cable nerve graft 6
  • 7. Iatrogenic injury • Facial nerve can be injured during – stapedectomy, – tympanoplasty – mastoid sx – Surgery of parotid tumors • Deliberatively excised in malignant tumors • Application of obstetrics forceps can result in facial paralysis in the neonate due to pressure in the extrapyramidal part of the nerve. 7
  • 8. Topodiagnostic tests • Useful in finding the site of lesion • Helps in establishing the etiology • To find out the site of surgical decompression • Various tests used are Schirmer test Stapedial reflex test Taste test Submandibular salivary flow test 8
  • 9. Schirmer test • Test for greater superficial petrosal nerve. • Compares the lacrimation of two sides. • A strip of filter paper is hooked in the lower fornix of each eye and the amt of wetting is measured. Stapedial reflex • Tested by Impedence audiometry. • It is a test for nerve to stapedius. 9
  • 10. Taste test • Measured by A drop of salt or sugar is placed on one side of the protuded tongue Electrogustometry • It is a test for chordae tympani. Submandibular salivary flow test •Measures the function of chorda tympani. •Polythene tubes are passed into both warton ducts and drops of saliva counted during one minute period. 10
  • 11. Fig. Topographic localization of facial nerve lesions 11