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Flashcards in Cranial Nerves Deck (33)
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1

CN I

olfactory nerve

2

function of CN I

olfactory nerve

sensory only
- detects odors

3

clinical significance of CN I

cribriform plate abnormalities can cause issues with this nerve

4

CN II

optic nerve

5

function of CN II

optic nerve

sensory only

night vision + lights + color

6

clinical significant of CN II

optic foramina development depends on vA in calves

7

CN III

oculomotor nerve

8

function of CN III

oculomotor nerve

motor only
innervates
- dorsal, medial, ventral rectus muscles
- levator palpebrae

parasympathetic innervation of pupillary constrictors

9

clinical significance of CN III

lack of function leads to ventrolateral strabismus and pupillary dilatation

10

CN IV

trochlear nerve

11

function of CN IV

trochlear nerve

motor only
- innervates the dorsal oblique muscle

12

clinical significance of CN IV

isolated lesions are very rare

crosses entirely to the contralateral side

13

CN V

trigeminal nerve

14

function of CN V

mixed nerve

three branches
1. ophthalamic branch
- sensory info from facial skin, nasal cavity, and around the eye

2. maxillary branch
- sensory info from the facial skin, nasal cavity, upper teeth, and hard palate

3. mandibular branch
- sensory info. from the rostral 2/3 of the tongue, lower jaw skin, lower teeth, cheek mucosa
- motor info to masticatory muscles

15

clinical significance of CN V

damage to the mandibular branch can cause issues with eating

masticatory myositis

head shaking in horses

motor neuron nuclei vacuolization in goats

16

CN VI

abducens nerve

17

function of CN VI

motor only

innervates
- lateral rectus
- retractor bulbi

18

clinical significance of CN VI

damage
- cannot move eye to the side to follow something (laterally)

19

CN VII

facial nerve

20

function of CN VII

sensory:
- rostral 2/3 of the tongue*
- palate*
- external ear canal
*salivation reflex

motor:
- facial expressions: eyelid, ear, lips, cheek, nostrils

parasympathetic fibers
- mandibular and lingual salivary glands

21

clinical significance of CN VII

damage

paralysis of face
- face appears pulled to the side with functioning neuron(s)

bilateral paralysis
- animal doesn't lift ears

22

CN VIII

vestibulocochlear

23

function of CN VIII

sensory only

balance and hearing

only CN that doesn't leave the skull

24

clinical significance of CN VIII

can damage only one portion and have balance issues

25

CN IX

glossopharyngeal

26

function of CN IX

mixed nerve

sensory:
- caudal 1/3 of tongue
- pharynx (important for swallowing and gag reflex)

motor:
- muscles of pharynx

parasympathetic fibers
- parotid and zygomatic salivary glands

27

CN X

vagus nerve

28

function of CN X

mixed nerve

sensory:
- external acoustic meatus

motor:
- larynx
- pharynx
- esophagus

large parasympathetic role:
- heart
- GI tract
- resp. tract

29

CN XI

accessory nerve

30

function of CN IX

motor only

larynx

cleidocephalicus
trapezius

31

CN XII

hypoglossal nerve

32

function of CN XII

motor only

tongue
- intrinsic muscles
- hypoid apparatus: geniohyoideus, stylohyoideus, thyrohyoideus

33

clinical significance of CN XII

loss of function results in lolling tongue

sticks out to the normal side because the affected side isn't pulling it back