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Flashcards in Cranial Nerves Deck (49):
1

CN I goes from nasal cavity to olfactory bulb via?. Carries what information?

cribiform foramina --> olfactory bulb
olfaction (sensory)

2

CN II is made of? Enters the skull via? Carries what type of information?

axons of retinal ganglion cells
enter skull via optic canal
carries vision information (sensory)

3

CN III enters the orbit through

superior orbital fissure

4

What does CN III do?

motor: eye movement & levator palpebrae superioris
parasym: miosis

5

CN III carries preganglionic parasympathetics from the __ to the ___ . Post-ganglionics then project to the eye via ___

midbrain to the ciliary ganglion
short ciliary nerve

6

CN IV enters orbit via? what does it innervate?

enters via superior orbital fissure
innervates superior oblique muscle of eye

7

What are the three divisions of the trigeminal nerve?

ophthalmic - V1
maxillary - V2
mandibular - V3

8

Where does V1 enter the skull?

superior orbital fissure

9

Where does V2 exit the skull?

foramen rotundum

10

Where does V3 exit the skull?

foramen ovale

11

What does V3 innervate (motor)?

motor muscles of mastication

12

Cutaneous sensory branches of V1 exit through

supraorbital foramen
(supraorbital nerve)

13

Cutaneous sensory branches of V2 exit through

infraorbital foramen
(infraorbital nerve)

14

Cutaneous sensory branches of V3 exit through

mental foramen
(mental nerve)

15

What is the fcn of CN V?

motor muscles of mastication (V3)
general sensory from face & scalp

16

What nerve innervates corneal surface?

V1

17

The sensory limb of the corneal reflex is carried through CN ___ and the motor limb is carried through CN ___

V sensory
VII motor

18

CN VI enters orbit through

superior orbital fissure

19

What is the function of CN VI?

lateral rectus muscle of eye (abducts eye)

20

CN VII leaves the skull from the ___ through the ___ out the ___

internal acoustic meatus
facial canal
stylomastoid foramen

21

After exiting the skull, the CN VII divides into what branches

temporal
zygomatic
buccal
mandibular
cervical

22

What nerve is responsible for parasympathetic innervation of lacrimal gland

greater petrosal nerve (branch of facial)

23

How does the facial nerve innervate the lacrimal gland (parasym)?

Greater petrosal nerve exits skull via pterygoid canal and synapses on pterygopalatine ganglion in pterygopalatine fossa. From there, post-ganglionic parasympathetics joint the maxillary nerve --> zygomatic nerve --> lacrimal nerve --> lacrimal gland

24

The chorda tympani connects the __ with the __

facial nerve with lingual nerve

25

How does the facial nerve innervate submandibular and sublingual glands?

facial nerve --> chorda tympani --> lingual nerve --> submandibular ganglion (SYNAPSE) --> submandibular gland
OR
submandibular ganglion (SYNAPSE) --> lingual nerve --> sublingual gland

26

What are the functions of the facial nerve?

motor: muscles of facial expression
sensation: taste from anteiror 2/3 of tongue
parasympathetic: innervation of lacrimal gland, sublingual and submandibular glands

27

How does taste & general sensation from the anterior 2/3 of the tongue travel?

lingual nerve --> chorda tympani --> facial nerve (TASTE)
lingual nerve --> V3 (GEN SEN)

28

The lingual nerve is a branch of the

mandibular nerve (V3)

29

CN VIII carries output from ___

hair cells in the inner ear

30

CN VIII enters skull via

internal acoustic meatus

31

What is the function of CN VIII

hearing and balance

32

The lesser petrosal nerve is a branch of

CN IX

33

CN IX exits the skull via

jugular foramen

34

The lesser petrosal nerve exits the skull via

foramen ovale

35

For innervation of the parotid gland, pre-ganglionics carried by the ___ and __ _nerves to the ____ ganglia and then postganglionics carried by the ____ (a branch of V3) to the parotid gland

tympanic nerve & lesser petrosal nerve
otic ganglia
auriculotemporal nerve
parotid gland

36

What nerve innervates parotid gland?

lesser petrosal nerve (branch of CN IX)

37

What are the functions of CN IX

motor: stylopharyngeus
sensory: taste & gen sensation from posterior 1/3 tongue; gen sen soft palate
parasym: parotid gland (lesser petrosal n)
afferent limb gag reflex

38

Where does the vagus nerve exit the skull?

jugular foramen

39

What are the functions of the vagus nerve?

motor: muscles of pharynx & palatoglossus
sensory: pharynx & larynx; viscera of thorax & abdomen
parasym: innervation as far as transverse colon; striated muscles of heart
efferent limb gag reflex

40

What nerve is principal source of laryngeal muscle innervation and contributes to phonation and deglutition

recurrent laryngeal nerve (branch of vagus)

41

What cranial nerves contribute to pulling up the larynx to close the airway during deglutition?

CN IX - stylopharyngeus
CN X - muscles of pharynx

42

What nerve is the afferent limb for the Gag reflex? efferent limb?

afferent - CN IX
efferent - CN X

43

What is the origin of fibres for the spinal accessory nerve?

upper cervical cord that enter the skull through foramen magnum

44

Where does the spinal accessory nerve leave the skull?

jugular foramen

45

What does CN XI do?

Motor: SCM & trapezius

46

Where does CN XII exit the skull?

hypoglossal canal

47

What does CN XII do?

motor innervation to all muscles of the tongue except palatoglossus (CN X)

48

What is the only pharyngeal muscle innervated by CN IX? All others are innervated by?

stylopharyngeus
CN X

49

The only autonomic function associated with cranial nerves is parasympathetic or sympathetic?

parasympathetic