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SPECIAL SENSE > [ANAT] NERVES OF ORBIT > Flashcards

[ANAT] NERVES OF ORBIT Flashcards

1
Q

nerve of vision

A

optic nerve

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2
Q

smallest division of trigeminal purely sensory

A

ophthalmic

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3
Q

optic nerve is made up on

A

axons of ganglionic layer of retina

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4
Q

optic nerve piecers sclera at

A

3mm medial to posterior pole

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5
Q

optic nerve is enclosed in?

A

3 meningeal sheaths

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6
Q

optic nerve lacks

A

neurilemmal sheath
(can’t regenerate+ is a tract)

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7
Q

length & parts of optic nerve

A

40mm
intraorbital= 25mm
intracanalicular= 5mm
intracranial=10mm

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8
Q

reason behind tortuosity of optic nerve

A

allows free movement of eyeball

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9
Q

optic nerve is surrounded by

A

recti muscles (@ apex)
short ciliary nerves
fat

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10
Q

ciliary ganglion location

A

between optic nerve & tendon of LR

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11
Q

optic nerve is pierced by?

A

central retinal artery & vein

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12
Q

optic nerve is crossed by

A

N-O-S
nasociliary nerve
ophthalmic artery
superior div ophthalmic vein

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13
Q

relation of optic nerve to ophthalmic artery inside optic canal

A

above & medial to ophthalmic artery

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14
Q

relation of optic nerve to ICA inside cranial cavity

A

ICA is lateral to optic nerve

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15
Q

intra-orbital blood supply of optic nerve

A

posterior ciliary arteries
central retinal artery

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16
Q

intra-canalicular blood supply of optic nerve

A

ophthalmic artery

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17
Q

intracranial blood supply of optic nerve

A

superior hypophyseal artery

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18
Q

unilateral papilloedema is a sign of

A

optic neuritis

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19
Q

bilateral papilloedema is a sign of

A

increased ICT

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20
Q

aneurysm of ___can lead to lesion in optic chiasma

A

ICA

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21
Q

nerves passing through lateral wall of cavernous sinus

A

T-O-O
trochlear
ophthalmic
oculomotor

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22
Q

branches of ophthalmic nerve

A

lacrimal
frontal
nasociliary

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23
Q

supplies lacrimal gland & lateral part of upper eyelid

A

lacrimal n (ophthalmic)

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24
Q

smallest branch of ophthalmic

A

lacrimal

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25
Q

supplies skin of forehead & upper eyelid

A

supratrochlear n (ophthalmic)

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26
Q

supplies frontal air sinus

A

supraorbital (ophthalmic)

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27
Q

supplies skin of forehead + scalp up to vertex + frontal air sinus

A

supraorbital n (ophthalmic)

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28
Q

supplies lateral part of upper eyelid

A

supratrochlear n (ophthalmic)

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29
Q

supplies cornea, iris, ciliary body

A

large ciliary nerves (nasociliary of ophthalmic)

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30
Q

supplies ethmoidal & sphenoidal air sinuses

A

posterior ethmoidal nerve (nasociliary of ophthalmic)

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31
Q

supplies skin of upper eyelid + side of nose

A

infratrochlear nerve (nasociliary of ophthalmic n)

32
Q

only nerve to decussate

A

trochlear

33
Q

largest branch of ophthalmic

A

frontal

34
Q

lacrimal & frontal nerves enter SOF through

A

lateral part

35
Q

nasociliary nerve enters SOF through

A

medial part

36
Q

runs above LR with lacrimal artery

A

lacrimal n (of ophthalmic)

37
Q

runs between periosteum & LPS

A

frontal n (of ophthalmic)

38
Q

lacrimal nerve receives communication from

A

ZT nerve (postganglionic secretomotor fibers of pterygopalatine ganglia)

39
Q

pterygopalatine ganglia sends postganglionic secretomotor fibers to

A

lacrimal nerve (of ophthalmic)

40
Q

branches of frontal nerve

A

supratrochlear
supraorbital

41
Q

intermediate branch of ophthalmic

A

nasociliary

42
Q

nasociliary crosses

A

optic nerve
(Lat—>Med)

43
Q

nasociliary is situated between

A

2 divisions of oculomotor

44
Q

branches of nasociliary (5)

A

infratrochlear
long ciliary
posterior ethmoidal
anterior ethmoidal
communicating branch

45
Q

branch forming the sensory root of the ciliary ganglion

A

communicating branch of nasociliary n (of ophthalmic)

46
Q

nerve carrying MOTOR SYMPATHETIC fibers to dilator pupillae

A

long ciliary

47
Q

anterior ethmoidal course and branch?

A

anterior ethmoidal foramen–>
cranial cavity–>
cribriform plate–>
crista galli–>
nasal cavity
leaves nasal cavity as external nasal nerve

48
Q

oculomotor attachment to brain

A

anterior midbrain
medial side of cerebral peduncle

49
Q

oculomotor is situated between

A

superior cerebellar artery
PCA

50
Q

nerve piercing dura IN FRONT of crossing of tentorium cerebelli

A

3rd

51
Q

nerve piercing dura AT point of crossing of tentorium cerebelli

A

4th

52
Q

nerve piercing dura opposite the clivus

A

6th

53
Q

superior division of oculomotor supplies

A

SR
LPS

54
Q

inferior division of oculomotor supplies

A

IO
IR
MR

55
Q

nerve sending MOTOR PARASYMPATHETIC fibers to constrictor pupillae & ciliary muscles

A

nerve to inferior oblique

56
Q

oculomotor palsy cc by? (6)

A

ptosis
diplopia
proptosis
loss of accommodation
lateral squint
dilatation

57
Q

trochlear nerve supplies

A

CONTRALATERAL SO

58
Q

emerges from dorsal aspect of brainstem below inferior colliculus

A

trochlear

59
Q

trochlear nerve is situated between

A

superior cerebellar artery & PCA

60
Q

trochlear nerve enters orbit through

A

SOF OUTSIDE tendinous ring

61
Q

diplopia when walking down the stairs

A

trochlear nerve palsy

62
Q

trochlear nerve palsy cc by?

A

diplopia

63
Q

attached to medial lower border of pons

A

abducent

64
Q

runs through cisterna pontis

A

abducent

65
Q

abducent nerve’s relation to ICA intracranially?

A

infero-lateral to ICA

66
Q

abducent nerve supplies

A

LR

67
Q

abducent nerve palsy cc by?

A

medial squint
diplopia

68
Q

parasympathetic supply to

A

constrictor pupillae
ciliary muscles

69
Q

sympathetic supply to

A

dilator pupillae
LPS

70
Q

secretomotor supply to

A

lacrimal gland

71
Q

motor parasympathetic fibers are carried on

A

nerve to inferior oblique

72
Q

sympathetic fibers are carried on

A

long ciliart muscles

73
Q

sympathetic root is a branch of

A

ICA plexus

74
Q

sensory root is a branch of

A

nasociliary nerve

75
Q

dilator pupillae sympathetic supply is through

A

long ciliary nerves
superior cervical plexus

76
Q

short ciliary muscles contain (3)

A

efferent postgang parasympathetic
efferent postgang sympathetic
afferent sensory from eyeball

77
Q

pathway of sensory root carrying impulses from eye

A

eye–>
short ciliary nerve–>
ciliary ganglion–>
ophthalmic nerve–>
V ganglion–>
V sensory root–>
V sensory nuclei

SPECIAL SENSE (12 decks)

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