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Emma H&N > Cranial Nerve Lecture > Flashcards

Cranial Nerve Lecture Flashcards

1
Q

sensory innervation of anterior 2/3 of tongue

A

lingual n. (br. of V3)

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2
Q

taste sensation of anterior 2/3 of tongue

A

chorda tympani n.

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3
Q

general sensation and taste innervation of posterior 1/3 of tongue

A

glossopharyngeal n. (CN IX)

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4
Q

CN VII somatic motor component

A

enters internal auditory meatus –> facial canal of temporal bone –> emerges from stylomastoid foramen

innervates facial muscles + stylohyoid, posterior belly of digastric, stapedius

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5
Q

CN VII parasympathetic component

A
  1. intermediate n. –> greater petrosal n. (to pterygopalatine ganglion, glands in eye, nose, palate)
  2. intermediate n. –> chorda tympani (to submandibular ganglion, sublingual and submandibular salivary glands in oral cavity)
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6
Q

CN VII special sensory component

A

taste fibers return from anterior 2/3 of tongue via piggybacking lingual n. (V3)

travels back through petrotympanic fissure w/ chorda tympani

encounter geniculate ganglion and return to CNS

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7
Q

CN V somatic sensory component

A

from trigeminal ganglion
V1 –> ophthalmic division
V2 –> maxillary division
V3 –> mandibular division

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8
Q

CN V somatic motor component

A

V3 (mandibular division) –>

4 m. of mastication
4 accessory n. of mastication

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9
Q

CN IX somatic motor component

A

thru jugular foramen to stylopharyngeus m.

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10
Q

CN IX somatic sensory component

A

thru jugular foramen to back of pharynx (gag reflex)

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11
Q

CN IX visceral sensory component

A

thru juglar foramen to carotid body/carotid sinus

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12
Q

CN IX special sensory component

A

thru jugular foreman to posterior 1/3 of tongue

taste and general sensory

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13
Q

CN IX visceral motor component

A

thru jugular foramen –> tympanic canaliculus “tympanic n.” –> forms plexus in middle ear –> emerges from middle ear as LESSER PETROSAL N. …

thru foramen ovale –> synapses on OTIC ganglion –> postganglionic fibers of lesser petrosal n. piggyback on AURICULOTEMPORAL n. (V3) –> jump off to supply PAROTID gland

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14
Q

CN III somatic motor component

A

oculomotor nucleus –> orbit –> split to sup/inf divisions –> supply 5 of 7 extraocular m.

superior rectus
inferior rectus
medial rectus
inferior oblique
levator palpebrae superioris
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15
Q

CN III visceral motor component

A

accessory oculomotor nucleus –> orbit –> inferior division CN III –> ciliary ganglion –> supply ciliary m. and sphincter pupillae

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16
Q

CN X visceral motor component

A 
jugular foramen 
--> to glands and smooth muscle in...
larynx
pharynx
esophagus
abd viscera

–> to HEART

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17
Q

CN X somatic motor component

A

jugular foramen –> to…
pharyngeal constrictors
laryngeal m.
palatal m.

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18
Q

CN X special sensory component

A

jugular foramen –> to epiglottis (taste buds)

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19
Q

CN X somatic sensory component

A

jugular foramen –> to…
ear/canal
LARYNX (via superior/recurrent laryngeal n.)
dura

20
Q

CN I

A

olfactory n.
special sensory only.

does NOT originate in brain stem.
originates in nose.

olfactory axons –> cribriform plate –> synapse on olfactory bulb of olfactory tract

21
Q

olfactory tract

A

extension of the brain.

covered by meninges.

22
Q

CN II

A

optic n. (extension of brain, covered by meninges)

light stim retina –> APs travel down optic n. –> some cross at optic chiasm, others don’t –> travel down “optic TRACT” –> occipital lobe for interpretation by visual cortex

23
Q

optic n. vs optic tract

A

globe –> chiasm = optic n.

posterior to chiasm = optic tract

24
Q

axons of retinal ganglion cells make up the

A

optic n.

25
Q

CN IV

A

trochlear n.

somatic motor only.

devoted to one m. in eye (superior oblique m.)

26
Q

CN VI

A

abducent n.

somatic motor only.

devoted to one m. in eye
(lateral rectus m. –> moves eye LATERALLY)

27
Q

CN IV and CN VI are _____ motor only

A

SOMATIC motor only.

28
Q

CN IIII
CN IV
CN VI
CN V(V1)

all enter thru …

A

superior orbital fissure

between greater and lesser wings of sphenoid bone

29
Q

CN XI

A

spinal accessory n. (imposter, does NOT arise from brain stem)

somatic motor to SCM and trapezius.

fibers from spinal nuclei –> foramen magnum –> U-turn out through jugular foramen –> to SCM and trapezius

30
Q

CN XII

A

hypoglossal n.

somatic motor only to tongue.

rootlets emerge from groove between pyramids/olive of medulla oblongata –> exits skull through hypoglossal canal –> innervates…

genioglossus
hyoglossus
stylglossus

31
Q

palatoglossus m. innervation

A

CN X

32
Q

genioglossus m. originates from

A

genial tubercles

33
Q

CN VIII

2 nerves?

A

vestibulochoclear n.

enters internal acoustic meatus and splits into 2 divisions, both special sensory.

vestibular division –> balance
cochlear division –> hearing

34
Q

CN VIII

path of vestibular division

A

enter internal acoustic meatus –> anterior toward cochlea for hearing

35
Q

CN VIII

path of cochlear division

A

enter internal acoustic meatus –> back toward semicircular canals for balance

36
Q

eye movement via oculomotor n. vs abducent n.

A

oculomotor n. –> most actions of eye

abducent n. –> specifically abduction (lateral movement of eye)

37
Q

postganglionic fibers of greater petrosal n. to the ORBIT piggyback on ____ n.

A

postganglionic fibers of greater petrosal n. to the orbit piggyback on V1 and V2 n.

38
Q

postganglionic fibers of greater petrosal n. to the PALATE AND NOSE piggyback on ____ n.

A

postganglionic fibers of greater petrosal n. to the PALATE AND NOSE piggyback on V2 n.

39
Q

From where does the intermediate n. originate?

A

superior salivatory nucleus

40
Q

Path of intermediate n. to glands of eye

A 
intermediate n. --> 
internal acoustic meatus --> 
facial canal -->
genu -->  
fwd direction, "greater petrosal n." -->
crosses foramen lacerum --> 
vidian canal --> 
pterygopalatine fossa -->
in orbit, piggybacks on V1 and V2
--> synapses on pterygopalatine ganglion
41
Q

Path of intermediate n. to hard and soft palate

A 
intermediate n. --> 
internal acoustic meatus --> 
facial canal -->
genu -->  
fwd direction, "GREATER PETROSAL N." -->
crosses foramen lacerum --> 
vidian canal --> 
pterygopalatine fossa -->
piggyback on V2 --> 
V2 synapses on pterygopalatine ganglion-->
postganglionic fibers go to nose, or through palatine canal to hard and soft palate
42
Q

Path of intermediate n. to salivary glands

A 
intermediate n. --> 
internal acoustic meatus --> 
facial canal -->
genu -->  
path thru temporal bone, "CHORDA TYMPANI N." -->
middle ear -->
petrotympanic fissure --> 
submandibular ganglion in oral cavity 
--> post ganglionic fibers to salivary glands
43
Q

vidian canal

A

from foramen lacerum in the middle cranial fossa to the pterygopalatine fossa

44
Q

V1 dermatome

A

(ophthalmic division)

nasal cavity
paranasal sinuses
meninges

45
Q

V2 dermatome

A

(maxillary division)

nasal cavity 
paranasal sinuses
meninges
hard/soft palate
maxillary teeth/oral mucosa
46
Q

greater petrosal n. vs. lesser petrosal n.

A

greater petrosal n. –> piggybacks w/ CN VIII to EYES/NOSE/PALATE

lesser petrosal n. –> piggybacks w/ CN IX to PAROTID gland

Emma H&N (49 decks)

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