CN II

Question 1

CN II - _____

Answer 1

optic nerve

Question 2

function and class of CN II

Answer 2

SSA - vision

Question 3

the optic nerve exits ______

Answer 3

optic canal

Question 4

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

Answer 4

photoreceptors

Question 5

significance of fovea

Answer 5

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

Question 6

what forms the optic nerve

Answer 6

axons of ganglionic layer converges at optic disc and leaves eye

Question 7

myelinates the optic nerve

Answer 7

oligodendrocytes

Question 8

union of 2 optic nerves

Answer 8

optic chiasm

Question 9

the optic chiasm is located at the _____

Answer 9

junction of anterior wall and floor of 3rd vent

Question 10

anterolateral angles are cont w ______

Answer 10

optic nerves

Question 11

posterolateral angles are cont w ______

Answer 11

optic tracts

Question 12

path of nasal half of retina and macula

Answer 12

cross midline and enter opposite optic tract

Question 13

path of temporal half of retina and macula

Answer 13

pass posteriorly in optic tract of same side

Question 14

the optic tract emerges from _____

Answer 14

optic chiasm

Question 15

the optic tract pass posterolaterally around the ______

Answer 15

cerebral peduncle

Question 16

the optic tract terminates by synapsing with _____

Answer 16

lateral geniculate body

Question 17

aside from LGB where does optic tract pass

Answer 17

pretectal nucleus and sup coll for light reflex

Question 18

axons that leave the LGB are called _______

Answer 18

optic radiation

Question 19

path of LGB

Answer 19

pass posterior through retrolenticular internal capsule and terminates in visual cortex

Question 20

visual cortex is BA ____

Answer 20

BA 17 - upper and lower lips of calcarine sulcus

Question 21

visual association cortex is BA ____

Answer 21

18 and 19 - object recognition and color

Question 22

specialized receptors in retina

Answer 22

rods and cones

Question 23

connects rods and cones to ganglion cells

Answer 23

bipolar neurons

Question 24

ganglion cells axons pass to _____

Answer 24

LGB

Question 25

neurons of LGB pas to _____

Answer 25

cerebral cortex

Question 26

exp binocular vision

Answer 26

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

Question 27

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

Answer 27

left optic tract

Question 28

LGB project R field to _____

Answer 28

L visual cortex

Question 29

LGB project L field to _____

Answer 29

R visual cortex

Question 30

lower retinal quadrants - _____ field

Answer 30

upper field

Question 31

upper retinal quadrants - _____ field

Answer 31

lower field

Question 32

lower retinal quadrants project ______

Answer 32

lower wall of calcarine sulcus

Question 33

upper retinal quadrants project ______

Answer 33

upper wall of calcarine sulcus

Question 34

exp direct light reflex

Answer 34

pupil constricts where light is shone

Question 35

exp consensual light reflex

Answer 35

constriction of contralateral pupil

Question 36

discuss pathway for direct and consensual light reflex

Answer 36

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

Question 37

purpose of accommodation reflex

Answer 37

for near vision

Question 38

exp near vision

Answer 38

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

Question 39

purpose of pupillary constriction

Answer 39

restricts light into thickest central part of lens

Question 40

pupillary constriction is performed by

Answer 40

pupillary constrictor muscles of iris

Question 41

purpose of lens thickening

Answer 41

inc lens refractive power

Question 42

lens thickening is performed by

Answer 42

ciliary muscles

Question 43

lens in normally under tension from _____

Answer 43

suspensory ligament

Question 44

visual cortex is connected to the ______

Answer 44

frontal eye field

Question 45

what is corneal reflex

Answer 45

light touch of cornea or conjunctiva causes blinking

Question 46

afferent of corneal reflex

Answer 46

CN V - V1 or opthalmic div

Question 47

efferent of corneal reflex

Answer 47

CN VII

Question 48

facial nerve supply _____

Answer 48

orbicularis oculi for eyelid closure

Question 49

what is visual body reflex

Answer 49

auto scanning of eye and head auto movement of eye, head and neck protective closing of eyelids

Question 50

afferent impulse of visual body reflex is from _____

Answer 50

optic tracts to sup coll

Question 51

visual body reflexes are relayed to _____

Answer 51

tectospinal and tectobulbar