Cranial Nerves Flashcards Preview

Y3S1 NEURO > Cranial Nerves > Flashcards

Flashcards in Cranial Nerves Deck (15)
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1
Q

what is the order of the cranial nerves

A
  1. olfactory
  2. optic
  3. oculomotor
  4. trochlear
  5. trigeminal
  6. abducens
  7. facial
  8. acoustic
  9. glossopharyngeal
  10. vagus
  11. accessory
  12. hypoglossal
2
Q

Anosmia

A

 Olfactory neuropathy caused by upper respiratory tract infection
 Trauma, causing the brain and olfactory bulb to move may tear the olfactory nerves
 Fractures of the cribriform plate may cause CSF rhinorrhoea (blood stained CSF leaking from the nose)

3
Q

The skin over the angle of the mandible is not supplied by V, but

A

cervical plexus

4
Q

Injury to the trochlear nerve results in

A

the patient not being able to look medially and inferiorly
Superior Oblique
 Patient experience diplopia while walking downstairs or reading a book

5
Q

Injury to right abducent nerve

A

would cause diplopia when looking right – the right eye would not abduct fully

6
Q

facial nerve injury at the cerebellopontine angle

A

 Balance and hearing problems
 Ipsilateral facial muscle paralysis  Hyperacusis (pain on loud sounds)  Taste disturbances
 Reduced lacrimal secretion

7
Q

Facial nerve injury within the petrous temporal bone, depending on exact location

A

 Reduced lacrimal secretion
 Hyperacusis (pain on loud sounds)
 Taste disturbances
 Ipsilateral facial muscle paralysis

8
Q

fascial injury distal to the stylomastoid foramen

A

 Ipsilateral facial muscle paralysis

 Dry eye, drooling

9
Q

CENTRAL fascial palsy

A
  • upper motor neuron lesion

- can raise eyebrows, cannot blow cheeks

10
Q

PERIPHERAL fascial palsy

A
  • lower motor neurone lesion

- cannot raise eyebrows or blow cheeks

11
Q

injury to hypoglossal nerve

A

If injured, ipsilateral tongue weakness, therefore the tongue deviates to the side of the lesion

12
Q

HORNER’S SYNDROME

A

 Ptosis (drooping) of the upper eyelid
 Pupillary constriction (miosis)
 Anhydrosis (lack of sweating)
 Flushing of the face

13
Q

oculomotor nerve injury - No parasympathetic input for pupil constriction

A

Dilated pupil

14
Q

oculomotor nerve injury - Loss of motor innervation to

levator palpebrae superioris

A

 Ptosis

15
Q

oculomotor nerve injury - Loss of motor innervation to extraocular muscles except superior oblique (trochlear nerve) and lateral rectus (abducent nerve)

A

The eye turns downwards and outwards