Cranial Nerves Flashcards Preview

Gross Anatomy Exam 4 > Cranial Nerves > Flashcards

Flashcards in Cranial Nerves Deck (49):
1

Cranial nerves of midline

3, 6 and 12

2

What 2 cranial nn. are not distributed to the head?

Vagus and accessory nn.

3

Which cranial nn. conduct parasympathetic fibers?

3, 7, 9 and 10

4

Cranial nerve I

Olfactory

(Sensory)

5

Cranial nerve II

Optic

(Sensory)

6

Cranial nerve III

Oculomotor

(Motor)

7

Cranial nerve IV

Trochlear

(Motor)

8

Cranial nerve V

Trigeminal

(Both)

9

Cranial nerve VI

Abducens

(Motor)

10

Cranial nerve VII

Facial

(Both)

11

Cranial nerve VIII

Vestibulocochlear

(Sensory)

12

Cranial nerve IX

Glossopharyngeal

(Both)

13

Cranial nerve X

Vagus

(Both)

14

Cranial nerve XI

Accessory

(Motor)

15

Cranial nerve XII

Hypoglossal

(Motor)

16

What nerve does not come from the brainstem?

CN I (olfactory) → comes from olfactory bulb

17

CN I (olfactory) leaves the skull through?

Cribiform plate

18

Which nerve is technically a tract?

CN II (optic n.)

19

CN II (optic) connects?

Retina with diencephalon

20

Vision pathway

1. Retina
2. Optic n.
3. Optic chiasm
4. Optic tract
5. Lateral geniculate nucleus
6. Optic radiation

21

CN III (oculomotor) arises from?

Ventral aspect of mesencephalon

22

Where do oculomotor GVE fibers synapse?

Ciliary ganglion

23

Postganglionic oculomotor GVE fibers

Pass through ciliary nn. to supply ciliary and constrictor pupillae mm.

24

3 clinical signs of oculomotor n. dysfunction?

1. Lateral strabismus
2. Ptosis of superior eyelid
3. Mydriasis

25

Strabismus

Abnormal pointing of eye

26

Ptosis

Drooping

27

Mydriasis

Dilation of pupil

28

Pupillary light reflex pathway

1. Retina
2. Optic n.
3. Optic chiasm
4. Optic tract
7. Pretectal nuclei
8. Parasympathetic nucleus of CN III
9. Ciliary ganglion

29

CN IV (trochlear) arises from/

Dorsal aspect of mesencephalon

30

Clinical signs of CN IV (trochlear) dysfunction

Extorsion of eye

31

CN V (trigeminal) arises from?

Metencephalon

32

Mandibular n. function

1. Sensory to inferior arcade, lip, tongue
2. Motor to mm. of mastication (except cd. belly of digastricus)

33

CN VI (abducens) arises from?

Myelencephalon

34

Clinical signs of CN VI (abducens) dysfunction

Medial strabismus

35

CN VII (facial) arises from?

Myencephalon

36

How does VII (facial) give taste sensation to the rostral 2/3 of the tongue?

Via chorda tympani communication with lingual n.

37

Parasympathetic fibers of CN VII (facial) go to

1. Lacrimal gland
2. Nasal gland
3. Palatine gland
4. Mandibular salivary gland
5. Sublingual salivary gland

38

GVE fibers of CN VII (facial) go to the lacrimal, nasal and palatine glands via?

Pterygopalatine ganglion

39

Only cranial nerve to originate from dorsal aspect of brain?

CN IV (trochlear)

40

CN VIII (vestibulocochlear) arises from?

Myelencephalon near facial n.

41

CN IX (glossopharyngeal) arises from?

Lateral aspect of myencephalon

42

GVE fibers of CN IX (glossopharyngeal) supply?

Parotid and zygomatic salivary glands

43

Vagus n. arises from?

Lateral aspect of myelencephalon (in line with glossopharyngeal n.)

44

2 sensory ganglia associated with vagus n.

1. Proximal ganglion
2. Distal ganglion

45

What vagus fibers synapse at the cr. cervical ganglion?

Sympathetic

46

What vagus fibers synapse at the distal ganglion?

Parasympathetic

47

Proximal ganglion location

Jugular foramen (cannot be seen)

48

Distal ganglion location

Caudal to the cr. cervical ganglion

49

CN IX - XI exits cranial cavity via _____ and emerges from skull via _____

Jugular foramen, tympano-occipital fissure