GUMES cranial nerves Flashcards

1
Q

if a cranial nerve is developed from the pharyngeal arches, what is its function

A

branchial motor for voluntary muscles

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2
Q

what are some involuntary muscles controlled by the cranial nerves

A

sphincter pupillae and lacrimal glands

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3
Q

what are the sensory cranial nerves

A

olfactory
optic
trigeminal
facial
vestibulocochlear
glossopharyngeal
vagus

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4
Q

what are the motor cranial nerves

A

oculomotor
trochlear
trigeminal
abducens
facial
glossopharyngeal
vagus
spinal accessory
hypoglossal

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5
Q

which cranial nerves are both sensory and motor

A

trigeminal
facial
glossopharyngeal
vagus

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6
Q

what type of cranial nerve is olfactory

A

special sensory

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7
Q

where does smell sensation come from

A

olfactory epithelium of the nasal canals, nasal septum, and superior conchae

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8
Q

how can the epithelium of the olfactory nerve be described as

A

regenerating, as it can heal itself

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9
Q

what is anosmia

A

no smell

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10
Q

what is the first cranial nerve

A

the olfactory nerve

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11
Q

what is the second cranial nerve

A

the optic nerve

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12
Q

what type of nerve is the optic nerve

A

special sensory

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13
Q

where are the optic nerve cell bodies

A

in the retina

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14
Q

where does the optic nerve exit

A

the orbital canal, where it crosses over at the optic chiasm

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15
Q

what is the third cranial nerve

A

oculomotor

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16
Q

what type of cranial nerve is the oculomotor nerve

A

somatic motor for the eye and visceral for the pupil

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17
Q

where is the oculomotor nerve in the brain

A

the midbrain

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18
Q

what are the muscles of the eye under the control of the oculomotor nerve

A

superior rectus
medial rectus
inferior oblique
levator palpebrae superiorus

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19
Q

what does the superior rectus do

A

move eye up

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20
Q

what does the medial rectus do

A

move eye inward toward the nose

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21
Q

what does the inferior oblique muscle do

A

move eye up and outward

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22
Q

what does the levator palpebrae superiorus do

A

lift and close the eyelid

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23
Q

how does the oculomotor constrict the pupil

A

parasympathetic supply to the sphincter papillae and ciliary muscle via the ciliary ganglion

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24
Q

what is the longest cranial nerve

A

the vagus

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25
Q

what happens when the oculomotor does not work due to increases pressure in the brain

A

fixed dilated eye turned down and away from the nose

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26
Q

what type of cranial nerve is the trochlear nerve

A

somatic motor

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27
Q

what does the trochlear nerve control

A

the superior obique muscle

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28
Q

where are the cell bodies of the trochlear nerve found

A

in the midbrain

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29
Q

is trochlear a long nerve

A

no

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30
Q

why is the trochlear nerve rarely paralysed on its own

A

it is short

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31
Q

what results in isolated palsy of the trochlear nerve

A

diplopia

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32
Q

what does the superior oblique muscle do

A

abducts, depresses and rotates the eye

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33
Q

what is diplopia

A

double vision

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34
Q

which cranial nerves are the most important in dentistry

A

trigeminal and facial

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35
Q

what are the three divisions of the trigeminal nerve

A

opthalmic
maxillary
mandibular

36
Q

what does the opthalmic division of the trigeminal nerve do

A

general sensation from the cornea, skin of the forehead, scalp, eyelids, nose, mucosa of the nasal cavities and paranasal sinuses

37
Q

what is the function of the maxillary division of the trigeminal nerve

A

general sensation from face over the maxilla, upper lip, maxillary teeth, and the maxillary air sinuses.

38
Q

what innervates the maxillary teeth

A

superior alveolar nerve, a branch of the maxillary nerve from the trigeminal

39
Q

what are the functions of the mandibular division of the trigeminal nerve

A

general sensation and brachial motor

40
Q

describe the general sensation of the mandibular division of the trigeminal nerve

A

side of the mandible, mandibular teeth, mucosa of the mouth and anterior two thirds of the tongue

41
Q

what supplies the mandibular teeth

A

the interior alveolar nerve which travels along the border of the mandible and passes out of the mental foramen as the mental nerve

42
Q

describe the brachial motor function of the mandibular division of the trigeminal nerve

A

muscles of mastication

43
Q

what are the muscles of mastication

A

temporalis
masseter
lateral pteryhoid
medial pterygoid

44
Q

what is the sixth cranial nerve

A

the abducens

45
Q

what type of cranial nerve is the abducens

A

somatic motor

46
Q

what does the abducens arise from

A

the pons

47
Q

what does the abduences control

A

the lateral rectus muscle

48
Q

what type of cranial nerve is the facial nerve

A

brachial motor, visceral motor and special sensory

49
Q

describe the brachial motor function of the facial nerve

A

muscles of facial expression, scalp, stapedius

50
Q

what is the stapedius

A

the smallest bone in the body which dampens down loud noises

51
Q

describe the special sensory function of the facial nerve

A

taste sensation to the anterior two thirds of the tongue and the palate.

52
Q

describe the visceral motor function of the facial nerve

A

parasympathetic innervation of the submandibular and sublingual glands, as well as contorl of the lactrimal gland and the glands of the nose and palate

53
Q

what is the eighth cranial nerve

A

the vestibulocochlear

54
Q

what type of cranial nerve is the vestibularcochlear nerve

A

special sensory

55
Q

what does vestibular sensation of the vestibularcochlear nerve mean

A

valance

56
Q

what is the vestibulocochlear nerve responsible for

A

hearing and balance

57
Q

what is the clinical application of the vestibulocochlear nerve

A

internal acoustic neuroma, a benign condition that grows on the nerve

58
Q

what is the risk of removing the vestibular schwannoma

A

effects on hearing and balance

59
Q

what is the ninth cranial nerve

A

glossopharyngeal

60
Q

what are the functions of the glossopharyngeal nerve

A

somatic motor
visceral motor
visceral sensory
special sensory
somatic sensory

61
Q

what is the somatic motor function of the glossopharyngeal nerve

A

stylopharyngeus, which raises the pharynx

62
Q

what is the visceral function of the glossopharyngeus

A

parasympathetic innervation to the parotid gland

63
Q

what is the visceral sensory function of the glosspharyngeal nerve

A

innervation of the parotid gland, pharynx and middle ear

64
Q

what is the special sensory function of the glossopharyngeal nerve

A

posterior third of the tongue

65
Q

what is the somatic sensory function of the glossopharyngeal nerve

A

external ear

66
Q

what is the tenth cranial nerve

A

the vagus nerve

67
Q

what is the longest nerve

A

the vagus

68
Q

describe the innervation of the vagus nerve

A

parasympathetic

69
Q

what are the functions of the vagus nerve

A

somatic motor
visceral motor
visceral sensory
special sensory
general sensory

70
Q

describe the somatic motor function of the vagus nerve

A

muscles of the pharynx
intrinsic muscles of the larynx
palate muscles
upper two thirds of the oesophagus

71
Q

describe the visceral motor function of the vagus nerve

A

parasympathetic innervation of the trachea, bronchi, gastrointestinal tract, heart. rest and digest

72
Q

describe the visceral sensory function of the vagus nerve

A

sensation of the tongue, larynx, respiratory tract, heart, upper gastrointestinal tract to the left colic flexure

73
Q

describe the special sensory function of the vagus nerve

A

the epiglottis and palate

74
Q

describe the general sensory function of the vagus nerve

A

auricle, external auditory meatus

75
Q

what is the 11th cranial nerve

A

accessory

76
Q

what is the function of the accessory nerve

A

somatic motor

77
Q

which muscles are innervated by the spinal accessory nerve

A

sternocleidomastoid muscle
trapezius

78
Q

what does the sternocleidomastoid muscle do

A

rotate head to opposite side

79
Q

what does the trapezius muscle do

A

raises shoulders

80
Q

function of the hypoglossal nerve

A

somatic motor

81
Q

what is the 12th cranial nerve

A

hypoglossal

82
Q

what does the hypoglossal nerve control

A

the motor of the intrinsic and extrinsic muscles of the tongue apart from the palatoglossus

83
Q

what is responsible for taste sensation of the anterior two thirds of the tongue

A

chorda tympani

84
Q

what is responsible for sensation of the anterior two thirds of the tongue

A

the lingual nerve

85
Q

what provides sensation and taste to the posterior third of the tongue

A

the glossopharyngeal nerve

86
Q

what innervates the palatoglossus

A

the vagus nerve

87
Q

what innervates most of the muscles of the tongue

A

the hypoglossal