Facial nerve Flashcards

1
Q

What is Cranial nerve VII

A

Facial nerve

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2
Q

How can the facial nerve be injured in dental practise

A

Inserting the needle into the parotid and injecting to far when performing and inferior alveolar nerve block in the pterygomandibular fossa

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3
Q

What does the cervical branch of the facial nerve supply

A

Platysma

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4
Q

What does the marginal mandibular branch of the facial nerve supply

A

Depressor labii inferioris
Depressor anguli labii
Mentalis

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5
Q

What does the buccal branch of the facial nerve supply

A

Buccinator
Zygomaticus

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6
Q

What does the zygomatic branch of the facial nerve supply

A

Orbicularis Otis

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7
Q

What does the temporal branch of facial nerve supply

A

Occipitofrontalis
Orbicularis oculi
Corrigator supercili

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8
Q

What is the chord tympani

A

A branch off the facial nerve that travels with V3 (branch lingual nerve )and provides taste to anterior 2/3 tongue and parasympathetic to submandibular and sublingual glands

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9
Q

Once outside the skull what branches does the facial nerve give off

A

Posterior auricular nerve
Digastric ( posterior belly)
Stylohyoid nerve
5 branches in the parotid gland :
- temporals
-Zygomatic
-buccal
-marginal mandibular
-Cervical

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10
Q

What does the facial nerve supply

A

Muscles of expression
Parasympathetic to submandibular gland and sublingual gland
Taste to anterior 2/3 tongue ( via chord tympana)

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11
Q

Name the pathway of the facial nerve

MUST KNOW

A

Arises in the pons/medulla junction
Travels thru the internal acoustic meatus
Into the facial canal in the temporal bone
Here gives off the sensory chord tympani and a small branch to stapedius
Facial nerve continues down and exits thru the stylomastoid foramen in the temporal bones where it continues down toward the parotid gland ( pre partid 3 branches -posterior auriculotemporal
-posterior digastric
-stylohyoid branch
In parotid (-divides the gland in to 2 lobes ( it does NOT supply the parotid )-it divides into 5 branches
Temporal
Zygomatic
Buccal
Mandibular
Cervical

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12
Q

What type of nerve is facial nerve

A

Mixed - mostly motor

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13
Q

Name the 5 branches of the facial nerve that arise within the parotid gland and a muscle they supply

A

Temporal - superior part orbicularis oculi
Zygomatic - inferior part of orbicularis oculi’
Buccal - rigorous/orbicularis oris/bucinator
Mandibular - mentalis muscle
Cervical- platysma

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14
Q

What is chorda tympani course

A

Arises off the nerve in the temporal bone as goes thru facial canal
Travels in petrotympanic fissure. ( behind the TMJ )
Exits infra temporal fossa ( joins lingual nerve of V3)

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15
Q

What does the chord tympani supply

A

Pre and post ganglionic fibers supply - submandibular and sublingual glands

Taste to anterior 2/3 body of tongue

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16
Q

What nerve does the greater petrosal nerve come off

A

facial nerve (arises in temporal bone area)

17
Q

What does the greater petrosal nerve supply

A

Lacrimal gland - preganglionic parasympathetic fibers
Sensory/taste to palate

18
Q

What is a disease of the facial nerve

A

Bells palsy( idiopathic facial paralysis)

19
Q

What is bells palsy known as also

A

Idiopathic facial nerve palsy

20
Q

What is idiopathic facial nerve palsy also known as

A

Bells palsy

21
Q

What is bells palsy

A

UNILATERAL facial paralysis - rapid onset
( Justin Bieber had )
Cause unknown
Denture wears can get pain /discomfort asn dentures not fit well

22
Q

Treatment Bells palsy

A

Usually self resolves
- anti-inflammatory steroid - seems help
-antivirals ( not usually help)
physical therapy

23
Q

What Causes Bells palsy

A

Unknown
Inflammation ( swelling/compression ) or ? viral infection