4.1 Cranial Nerves Flashcards Preview

Semester 4- Head and Neck > 4.1 Cranial Nerves > Flashcards

Flashcards in 4.1 Cranial Nerves Deck (52):
1

What is the name of CN I?

Olfactory nerve

2

What is the function of the Olfactory nerve?

Provide a sense of smell

3

Where does CN I originate?

Olfactory mucosa --> cribriform plate --> olfactory bulb

4

What is anosmia?

Lack of smell

5

What can cause anosmia?

Trauma, meningtitis

6

What is the name of CN II?

Optic nerve

7

Describe the pathway of CNII

Retina --> Optic tract --> Optic canal --> Primary visual cortex

8

What is the name of CN III?

Occulomotor

9

Where does CN III originate?

Oculomotor nucleus

10

Describe the pathway of CN III?

Superior orbital fissure and splits into superior and inferior oculomotor nerve.

11

What is the function of the optic nerve?

Sight

12

What is the function of CN III?

Movement of 4/6 of the extraocular eye muscles and levator palpebrae superioris

13

How will a CN III nerve palsy present?

Down and out pupil
Enlarged pupil (mydriasis)

14

What is the name of CN IV?

Trochlear

15

What is the function of the trochlear nerve?

Moves eye down and in

16

Describe the pathway of CN IV

Trochlear nucleus --> cavernous sinus --> eye muscles

17

How may an infection on CN IV present?

Difficulty walking down the stairs

18

Why is CN IV susceptible to infections?

Longest and runs through cavernous sinus

19

What is the name of CN V?

Trigeminal

20

Where does the Trigeminal nerve originate?

Trigeminal sensory nucleus complex in the Pons

21

Name the 3 branches of CN V

Opthalmic (V1)
Maxillary (V2)
Mandibular (V3)

22

What is the function of the trigeminal nerve?

General sensation to the face and innervation of the muscles of mastication

23

What is trigeminal neuralgia?

Overactive sensory portion of CN V causes burning pain

24

What is the name of CN VI?

Abducens Nerve

25

Where does the abducens nerve originate?

Abducens nuclei in the pons

26

What is the function of the abducens nerve?

Lateral eye movements

27

What is the name of CN VII?

Facial nerve

28

Name the motor branches of the facial nerve

Temporal
Zygomatic
Buccal
Mandibular
Cervical

29

What do the sensory fibres of the facial nerve innervate?

Taste receptors of anterior 2/3rds of the tongue

30

What do the parasympathetic fibres of the facial nerve innervate?

Salivary and lacrimal glands

31

Which foramina do all branches of the facial nerve pass through?

Internal acoustic meatus

32

What is Bell's Palsy?

Idiopathic unilateral facial paralysis due to inflammation at the stylomastoid foramen

33

What is the name of CN VIII?

Vestibulocochlear

34

Describe the pathway of CN VIII

Cerebellopontine angle in the Pons, then splits into vestibular nerve and cochlear nerve.

35

What is the function of the vestibular nerve?

Control of balance

36

What is the function of the cochlear nerve?

Hearing

37

What test is done to check for sensory and conductive hearing loss?

Rinne and Webbers test

38

What is the name of CN IX?

Glossopharyngeal

39

What does the glossopharyngeal nerve give motor innervation to?

Stylopharyngeus

40

What does the glossopharyngeal nerve give sensory innervation to?

Oropharynx
Posterior 1/3rd tongue
Carotid sinus

41

What does the glossopharyngeal nerve give parasympathetic innervation to?

Parotid gland

42

Which pathway is CN IX in the gag reflex?

Afferent pathway

43

What is the name of CN X?

Vagus nerve

44

What does the vagus nerve give motor innervation to?

Muscles of the pharynx and larynx

45

What does the vagus nerve give sensory innervation to?

Laryngopharynx, ear

46

What does the vagus nerve give parasympathetic innervation to?

Heart, lungs, GI tract

47

Which pathway is CN X in the gag reflex?

Efferent pathway

48

What is the name of CN XI?

Accessory nerve

49

Which artery does CN XI follow?

Internal carotid artery

50

What does the Accessory nerve innervate?

SCM and trapezius

51

What is the name of CN XII?

Hypoglossal

52

What does the hypoglossal nerve innervate?

Intrinsic and extinsic muscles of the tongue