Cranial Nerve Exam Flashcards

1
Q

Pt has facial weakness following IAN - what has likely happened?

A

Pt has developed a palsy of the motor part of the facial nerve

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2
Q

How can facial nerve palsy w/ IAN occur?

A

If IAN not administered correctly - needle advanced too far posterior, result in LA permeating the facial nerve within the parotid gland

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3
Q

When would likely see facial palsy following incorrectly administered IAN?

A

Usually presents within mins but can be delayed

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4
Q

What are the terminal branches of the facial?

A

Temporal, zygomatic, buccal, mandibular, cervical

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5
Q

Where does the facial nerve split into terminal branches?

A

Parotid

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6
Q

What does temporal branch of facial nerve supply?

A

Frontalis and orbiculares oculi

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7
Q

What does zygomatic branch of facial nerve supply?

A

orbiuclaris oclui

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8
Q

What does buccal branch of facial nerve supply?

A

Buccinator and orbiculares oculi

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9
Q

What dose mandibular branch of facial nerve supply?

A

Muscles of lower lip and chin

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10
Q

What does cervical branch of facial nerve supply?

A

Platysma

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11
Q

How would assess for damage to facial nerve?

A

Temporal - raise eyebrow
Zygomatic - close eyes
Buccal - puff cheeks
Mandibular - smile

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12
Q

What is facial nerve?

A

Motor nerve - supply muscle of facial expression

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13
Q

How to manage this as dentist?

A

Reassure pt likely temporary and will wear off with anaesthetic
If struggling close eye needs eye patch, if unable to close needs eye drops to lubricate
Review next day to ensure worn off

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14
Q

What if function of trigeminal nerve?

A

Provided both motor and sensory function via 3 main branches - ophthalmic, maxillary and mandibular

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15
Q

Which branch of the trigeminal nerve is motor?

A

Mandibular branch to MoM

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16
Q

How would assess trigeminal nerve?

A

Test sensation - apply light touch
Motor - clench teeth and palpate massester

17
Q

What cranial nerve supplies taste to tongue?

A

Facial nerve via corda tympani (anterior 2/3rd)
Glossopharyngeal (posterior 2/3rd)

17
Q

If pt has reduced movement of tongue what nerve is likely to be affected?

A

Hypoglossal or vagus nerve
Hypoglossal - motor to all expect palatoglossus

18
Q

What will damage of the hypoglossal result in?

A

Deviaton of tongue to affected side