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SHB > Cranial Nerves > Flashcards

Cranial Nerves Flashcards

1
Q

I

A

S
Olfactory
SVA

Foramen: cribiform plate

Innervates: olfactory nasal mucosa (smell)

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2
Q

II

A

S
Optic
SSA

Foramen: optic foramen (canal)

Innervates: rods and cones of retina (vision)

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3
Q

III

A

M
Occulomotor
GSE, GVE

Foramen: sup orbital fissure

Innervates:
1) via ciliary ganglion to sphincter pupillae and ciliary muscles

2) sub, med, inf recti and inf. obl. eyeball muscles and levator palpebrae superioris

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4
Q

IV

A

M
Trochlear
GSE

Foramen: sup orbital fissure

Innervates: superior oblique eyeball muscle

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5
Q

V

A

B
trigeminal
GSE, SVE

1) Ophthalmic (sensory)

Foramen: sup orb. fissure

Innervates: skin of upper part of face (upper orbit and above)

2) maxillary (sensory)

Foramen: foramen rotundum

Innervates: skin of mid face, upper teeth, nasal and palatal mucosa

3) Mandibular (sensory and motor)

Foramen: foramen ovale

Innervates: skin of lower face and jaw, floor of mouth, mucosa and ant 2/3 tongue, lower teeth and gums, ear pinna and canal

Motor to muscles of mastication, ant. belly of digast., tensor tympani, mylohyoid, tensor palatini (first arch muscle)

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6
Q

VI

A

M
Abducens
GSE

Foramen: sup. orbital fissure

Innervates: motor to lateral rectus muscle (LR6)

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7
Q

VII

A

B
Facial
GVA, SVA,GSA,GVE,SVE

Foramen: internal auditory meatus

Innervates:

1) deep sensation from soft palate
2) taste buds from the anterior 2/3 of the tongue
3) sens from small pat of ear pinna
4) motor to submand and subling gls., lacrimal gls., glands of nasal mucosa
5) motor to musc., facial expression, post belly diagastric, stylohyoid, stapedius

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8
Q

VIII

A

S
Acoustic
SSA

Foramen: internal auditory meatus

Innervates:

1) organ of corti in cochlear duct
2) semicircular canals, utricle, saccule

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9
Q

IX

A

B
Glossopharyngeal
GVA, SVA,GSA,GVE,SVE

Foramen: jugular foramen

Innervates:

1) deep sens from post tongue, soft palate, pharynx, mucosa of tymp. cavity, post auditory tube, carotid body and sinus
2) taste buds post 1/3 of tongue and adjacent pharynx
3) gen sens from small part of ear pinna and canal
4) parotid salivary gland (secretomotor)
5) stylopharyngeaus muscle

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10
Q

X

A

B
Vagus
GVA,SVA,GSA,GVE,SVE

Foramen: jugular foramen

Innervates:

1) visc sens from pharynx, esoph, trachea, larynx and abdom visc
2) taste buds in epiglottis and glottis
3) sens from small part of ear pinna, canal, and tymp membr
4) thoracic and abdominal viscera
5) muscles of pharynx and larynx, lev palatini and cricothyroid

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11
Q

XI

A

M
Spinal accessory
SVE

Foramen: mag and jugular

Innervates:

motor to sternocleidomastoid and trapezius

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12
Q

XII

A

M
Hypoglossal
GSE

Foramen: hypoglossal canal

Innervates: intrinsic and extrinsic muscles of tongue (palatoglossus excepted)

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13
Q

GSE

A

general somatic efferent

motor to voluntary muscle

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14
Q

GSA

A

gen somatic afferent

sensation from skin, muscle, joint

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15
Q

GVE

A

gen visceral eff

motor to smooth muscle and glands

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16
Q

GVA

A

gen visceral aff

sensation from internal organs

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17
Q

SVE

A

special visceral eff

volunary motor to pharyngeal arch

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18
Q

SVA

A

special visceral aff

taste and smell

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19
Q

SSA

A

special somatic aff

vision hearing and balance

20
Q

What are the holes in the eye skull?

A

Standing room only stupid

Superior orbital fissure (3,4,V1, 6)
Foramen rotundum (V2)
Foramen ovale (V3)
Spinosum (middle meningeal artery)

21
Q

What muscles of mastication are motored by V3?

A

masseter
temporalis
lateral and medial pterygoid

PLUS
anterior belly digastric
mylohyoid
tensor veli palatini
tensor tympani
22
Q

What are all of the nerves that move the eyeball?

A

3, 4, 6

23
Q

What is nerves innervate eye muscles?

A

LR6 (SO4)3

Lateral rectus- 6
Superior rectus-4
Everything else- 3

24
Q

What nerve opens that pupil wide?

A

sympathetics (tarsal muscle of Mueller)

25
Q

What the functions of the oblique muscles?

A

IO UO SO DO

inferior oblique moves eye up and out
superior oblique moves eye down and out

26
Q

What nerves have parasympathetics?

A

3, 7, 9, 10

3, 7, 9 use branches of 5

7, 9, 10 taste function

27
Q

Why is chorda typamni tested a lot?

A

branch of 7

efferent parasym fibers to submandibular and sublingual gland

afferent anterior 2/3 tongue sensory info to brain

Jumps on branch of 5 (lingual n)

Greater petrosal nerve also jumps on branch of 5. Target is lacrimal, snot making nasal and pterogopalatine glands.

28
Q

What is the number 1 cause of Bell’s palsy?

A

Viral infection

Can’t taste, dry mouth, can cry- lesion brtween greater petriosal nerve and chorda tympani

29
Q

What nerve do you use to see?

A

CN II

30
Q

What nerve to Focus (lens)?

A

CN III (ciliary muscle)

31
Q

What nerve to Bright light?

A

CN III (sphinter pupillae)

32
Q

What nerve to Open your eyes?

A

CN III (levator palpebrae)

33
Q

What nerve to Force eyes close?

A

CN VII

34
Q

What goes through jugular foramen?

A

9, 10, 11

35
Q

What does vagus mean?

A

wanders into thorax and abdomen

parasympathenic innervation of organs

slows the heart while speeding up digestion

36
Q

What is the interesting origin of accessary nerve XI?

A

originates in Spinal cord
through foramen magnum into cranium
leaves jugular foramen

37
Q

What happens if accessary nerve lesioned?

A

inability to shrug shoulder on same side (trapezius)

or turn head to opposite side

38
Q

All muscles except one ending in glossus are intervated by CN 12. What is the exception?

A

palatoglossus (CN X)

39
Q

What happens if lesion to right CN III?

A

Right eye. downward and outward gaze, dilated pupil, eyelid manually elevated due to ptosis. cant bring eye medially.

40
Q

What happens if lesion to CN VII

A

Bells palsy

41
Q

What happens if lesion to right CN XI?

A

cant shrug right shoulder

42
Q

What happens if lesion to right CN XII?

A

Tongue bent to right

43
Q

What happens if lesion to left CN VI?

A

when looking toward left, left eye does not abduct so stays straight

44
Q

What does the vagus sit between?

A

Jugular and common carotid

45
Q

What sensory innervates the tongue?

A

Ant 2/3
Reg = 5
Taste = 7

Post 1/3
Reg and Taste= 9

Epiglottis taste = 10

All muscles innervated by 12 except palatoglossal

SHB (22 decks)

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