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254 midterm > Cranial Nerves > Flashcards

Cranial Nerves Flashcards

1
Q

What nerve is CNI

A

Olfactory nerve

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2
Q

What is the function of CNI

A

Sensory : smell

Also induces visceral responses via the ANS (ex: smell something good, salivate and hungry now)

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3
Q

What are the 2 parts of the olfactiry nerve?

A

Oflactory bulb and tract

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4
Q

What nerve is CNII

A

Optic nerve

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5
Q

What is the function of CNII

A

Sense: vision (somatic afferent)

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6
Q

What is the optic nerve formed by

A

retina ganglion axons that cover the optic disc at the back of the eye

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7
Q

how is CNII unique?

A

its surrounded by cranial meninges and subarachnoid space filled with CSF

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8
Q

T\fF:the optic nerve goes from the optic chiasma to the thalamus by way of optic tracts

A

true

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9
Q

T/F: all fibers terminate in the thalamus

A

false: some terminate in the thalamus, others in the superior colliculi of the corpora quadragememina before travelling to the occipital lobe

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10
Q

which lobe contains the visual cortex

A

occipital lobe

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11
Q

do all fibore cross at the optic chiasma?

A

no, only the medial nerve crosses

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12
Q

what is CNIII

A

occulomotor nerve

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13
Q

what is the function of CNIII

A

mainly motor

direct innervation of eye m. and huge role in proprioception

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14
Q

what m. does CNIII innervate

A 
sup, inf, and medial rectus
inf oblique m.
levator palpabrae m.
ciliary bodies of the lens
iris (pupil size)
reflex somatic adjustment (proprioception)
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15
Q

how does CNIII reach the eye

A

through the superior orbital fissure and then divides into sup and inf divisions

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16
Q

what does the inf division of CIII carry?

A

presynaptic autonomic fibers to the ciliary ganglion

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17
Q

what nerve is CNIV

A

trochlear nerve

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18
Q

What is the function of CNIV

A

mainly motor, superior oblique m.

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19
Q

where does CNIV originate

A

superiolateral aspect of the pons (posteriorly)

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20
Q

What bone structure does CNIV pass through

A

superior orbital fissure

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21
Q

what does an injury to CNIV cause

A

inhibits the eyeball from turning out and down

double vision

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22
Q

whats special about CNIV

A

its the only nerve that originates dorsally from the brainstem

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23
Q

what nerve is CNV

A

trigeminal nerve

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24
Q

what is the location of CNV

A

at the side of the pons

25
Q

what are the 3 divisions of the CNV

A

ophtalmic
maxillary
mandibular

26
Q

what 2 divisions are purely sensory

A

CNV1

CNV2

27
Q

What is the function of CNV1

A

sensory nerve that passes through superior orbital fissure
supplies the eyeball, conjunctiva, lacrimal gland and sac, nasal mucosa, frontal sinus, external nose, upper eyelid, forehead and scalp

28
Q

what is the function on CNV2

A

sensory nerve that passes through foramen rotundum
relays information from the skin of the face over the maxilla including the upper lip, maxillary teeth, nasal mucosa, maxillary sinuses and palate

29
Q

what is the function of CNV3

A

both motor and sensory
passes through foramen ovale
motor component: muscles of mastication
sensory component: skin over mandible, lower lip and side of head,mandibular teeth, muscosa of the mouth and the ant 2/3 of the tongue

30
Q

what is the CNVI nerve

A

abducens

31
Q

what is the function of CNVI

A

mainly motor: lateral rectus m

32
Q

where is the CNVI

A

rises between the pons and the medulla on the brain and will travel through the superior orbital fissure

33
Q

what nerve is CNVII

A

facial

34
Q

What is the function of CNVII

A

mixed

primarly motor but also sensory (taste)

35
Q

where is the facial nerve

A

emerges btw the pons and medulla on the brain and exits the skull through stylomastoid foramen
passes through parotid gland

36
Q

what do the many branches of CNVII supply

A

m. of facial expressions, taste to ant 2/3 of tongue, parasympathetic inn. to the submandibular, sublingual and lacrimal glands and mucous glands of the soft palate, nose and paranasal sinuses

37
Q

what nerve is CNVIII

A

vestibulocochlear

38
Q

what is the function of CNVIII

A

mixed, mainly sensory

39
Q

where is the CNVIII located

A

in the petrous portion of temporal b. at the internal auditory meatus

40
Q

t/f the vestibulocochlear n. exits the skull

A

false

41
Q

what are the 2 divisions of CNVIII and their role

A

vestibular (equilibrium)

cochlear (hearing)

42
Q

what nerve is CNIX

A

glossopharangeal

43
Q

what is the function of CNIX

A

mixed
it is responsible for conveying taste from the posterior 1/3 of the tongue
sensory inn to the pharyngeal mucosa, palatine tonsil, auditory tube, middle ear, carotid sinus and carotid body
stylophanrangeal m.
sensory function: proprioception of swallowing m. monitoring bp, o2, co2 in blood, BR and depth

44
Q

what glands does the CNIX supplie a parasympathetic innervation

A

parotid and salivary glands

45
Q

where does CNIX pass

A

jugular foramen & exists skull

46
Q

what nerve is CNX

A

vagus

47
Q

what is the function of CNX

A

sensation of inf pharynx, larynx and thoracic and abdominal viscera
taste from the root of the tongue and taste buds located on the epiglottis
m. of the soft palate, pharynx, intrinsic laryngeal m. and palatoglossus m of the tongue

48
Q

why it the vagus nerve called the wanderer

A

bc of its extensive innervation through the body (almost every where)

49
Q

where does the vagus n exit

A

jugular foramen

50
Q

what is the parasympathetic inn of CNX

A

thoracic and abdominal viscera down to splenic flexure

aut reg. of HR, BR, digestion, BP

51
Q

what are the 3 types of m that CNX innervates

A

skeletal (swallowing of pharynx and larynx)
smooth
cardiac

52
Q

What nerve is CNXI

A

accessory

53
Q

where does CNXI originate and exit

A

medulla oblongata

jugular foramen

54
Q

what is the function of CNXI

A

motor inn of stenocleidomastiod m and trapezius

55
Q

what nerve is CNXII

A

hypoglossal n

56
Q

where does CNXII originate and exit

A

medulla

from medulla through hypoglossal canal

57
Q

what does CNXII supply

A

motor innervations to all m. of the tongue except palatoglossus (vagus n.)

58
Q

mnemonic : sensory, motor, both

A

some say marry money but my brother says big brains matter more

59
Q

what goes through the foramen spinosum

A

middle meningeal artery

254 midterm (11 decks)

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