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ugat sa utak > CN II > Flashcards

CN II Flashcards

1
Q

CN II - _____

A

optic nerve

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2
Q

function and class of CN II

A

SSA - vision

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3
Q

the optic nerve exits ______

A

optic canal

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4
Q

it can be found in the outermost layer farthest from the lens

A

photoreceptors

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5
Q

significance of fovea

A

portion with less layers of retina to allow light to reach photoreceptors without distortion = highest visual acuity

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6
Q

what forms the optic nerve

A

axons of ganglionic layer converges at optic disc and leaves eye

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7
Q

myelinates the optic nerve

A

oligodendrocytes

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8
Q

union of 2 optic nerves

A

optic chiasm

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9
Q

the optic chiasm is located at the _____

A

junction of anterior wall and floor of 3rd vent

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10
Q

anterolateral angles are cont w ______

A

optic nerves

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11
Q

posterolateral angles are cont w ______

A

optic tracts

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12
Q

path of nasal half of retina and macula

A

cross midline and enter opposite optic tract

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13
Q

path of temporal half of retina and macula

A

pass posteriorly in optic tract of same side

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14
Q

the optic tract emerges from _____

A

optic chiasm

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15
Q

the optic tract pass posterolaterally around the ______

A

cerebral peduncle

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16
Q

the optic tract terminates by synapsing with _____

A

lateral geniculate body

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17
Q

aside from LGB where does optic tract pass

A

pretectal nucleus and sup coll for light reflex

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18
Q

axons that leave the LGB are called _______

A

optic radiation

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19
Q

path of LGB

A

pass posterior through retrolenticular internal capsule and terminates in visual cortex

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20
Q

visual cortex is BA ____

A

BA 17 - upper and lower lips of calcarine sulcus

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21
Q

visual association cortex is BA ____

A

18 and 19 - object recognition and color

22
Q

specialized receptors in retina

A

rods and cones

23
Q

connects rods and cones to ganglion cells

A

bipolar neurons

24
Q

ganglion cells axons pass to _____

A

LGB

25
Q

neurons of LGB pas to _____

A

cerebral cortex

26
Q

exp binocular vision

A

image on R eye field - nasal half of R retina and temporal half of L retina

27
Q

axons of the 2 retinal halves combine at optic chiasm to form _____

A

left optic tract

28
Q

LGB project R field to _____

A

L visual cortex

29
Q

LGB project L field to _____

A

R visual cortex

30
Q

lower retinal quadrants - _____ field

A

upper field

31
Q

upper retinal quadrants - _____ field

A

lower field

32
Q

lower retinal quadrants project ______

A

lower wall of calcarine sulcus

33
Q

upper retinal quadrants project ______

A

upper wall of calcarine sulcus

34
Q

exp direct light reflex

A

pupil constricts where light is shone

35
Q

exp consensual light reflex

A

constriction of contralateral pupil

36
Q

discuss pathway for direct and consensual light reflex

A

optic tract synapse w bilateral EDW - synapse w ciliary ganglion - short ciliary nerves - ciliary muscle - constrictor pupillae

37
Q

purpose of accommodation reflex

A

for near vision

38
Q

exp near vision

A

eyes converge via medial rectus to aim eyes near to the near fixation point

39
Q

purpose of pupillary constriction

A

restricts light into thickest central part of lens

40
Q

pupillary constriction is performed by

A

pupillary constrictor muscles of iris

41
Q

purpose of lens thickening

A

inc lens refractive power

42
Q

lens thickening is performed by

A

ciliary muscles

43
Q

lens in normally under tension from _____

A

suspensory ligament

44
Q

visual cortex is connected to the ______

A

frontal eye field

45
Q

what is corneal reflex

A

light touch of cornea or conjunctiva causes blinking

46
Q

afferent of corneal reflex

A

CN V - V1 or opthalmic div

47
Q

efferent of corneal reflex

A

CN VII

48
Q

facial nerve supply _____

A

orbicularis oculi for eyelid closure

49
Q

what is visual body reflex

A

auto scanning of eye and head

auto movement of eye, head and neck

protective closing of eyelids

50
Q

afferent impulse of visual body reflex is from _____

A

optic tracts to sup coll

51
Q

visual body reflexes are relayed to _____

A

tectospinal and tectobulbar

52
Q
A

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