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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
what are the 3 divisions of the CNV
ophtalmic maxillary mandibular
26
what 2 divisions are purely sensory
CNV1 | CNV2
27
What is the function of CNV1
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
what is the function on CNV2
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
what is the function of CNV3
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
what is the CNVI nerve
abducens
31
what is the function of CNVI
mainly motor: lateral rectus m
32
where is the CNVI
rises between the pons and the medulla on the brain and will travel through the superior orbital fissure
33
what nerve is CNVII
facial
34
What is the function of CNVII
mixed | primarly motor but also sensory (taste)
35
where is the facial nerve
emerges btw the pons and medulla on the brain and exits the skull through stylomastoid foramen passes through parotid gland
36
what do the many branches of CNVII supply
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
what nerve is CNVIII
vestibulocochlear
38
what is the function of CNVIII
mixed, mainly sensory
39
where is the CNVIII located
in the petrous portion of temporal b. at the internal auditory meatus
40
t/f the vestibulocochlear n. exits the skull
false
41
what are the 2 divisions of CNVIII and their role
vestibular (equilibrium) | cochlear (hearing)
42
what nerve is CNIX
glossopharangeal
43
what is the function of CNIX
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
what glands does the CNIX supplie a parasympathetic innervation
parotid and salivary glands
45
where does CNIX pass
jugular foramen & exists skull
46
what nerve is CNX
vagus
47
what is the function of CNX
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
why it the vagus nerve called the wanderer
bc of its extensive innervation through the body (almost every where)
49
where does the vagus n exit
jugular foramen
50
what is the parasympathetic inn of CNX
thoracic and abdominal viscera down to splenic flexure | aut reg. of HR, BR, digestion, BP
51
what are the 3 types of m that CNX innervates
skeletal (swallowing of pharynx and larynx) smooth cardiac
52
What nerve is CNXI
accessory
53
where does CNXI originate and exit
medulla oblongata | jugular foramen
54
what is the function of CNXI
motor inn of stenocleidomastiod m and trapezius
55
what nerve is CNXII
hypoglossal n
56
where does CNXII originate and exit
medulla | from medulla through hypoglossal canal
57
what does CNXII supply
motor innervations to all m. of the tongue except palatoglossus (vagus n.)
58
mnemonic : sensory, motor, both
some say marry money but my brother says big brains matter more
59
what goes through the foramen spinosum
middle meningeal artery

254 midterm (11 decks)

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