Nbeo Ocular Phys/neurophys

Front 1

which retinal layer receives nutrients from both the retinal and choroidal vasculature

Back 1

outer plexiform layer

Front 2

normally dye used in fluroscein angiography cannot pass from the choroid into retinal tissue b/c

Back 2

RPE contains zonula occludens

Front 3

one site of blood-aqueous barrier is

Back 3

nonfenestrated iris capillaries

Front 4

which tissue has highest rate of bloow blow

Back 4

choroid

Front 5

perfusion pressure w/in the retina is dependent on difference b/w the pressure w/in retinal arteries and pressure w/in the

Back 5

retinal veins

Front 6

the autoregulated vessels of retinal maintain a steady blood flow and will counteract a reduction in perfusion pressure

Back 6

by reducing vascular resistance

Front 7

the preliminary change that occurs in a blink is

Back 7

contraction of palpebral portion of orbicularis

Front 8

free sterols, including cholesterol, are component of secretion of

Back 8

meibomian glands

Front 9

what is an accurate assessment of jone's lacrimal pump theory

Back 9

negative pressure in lacrimal sac draws tears in from canaliculi during orbicularis contraction

Front 10

whihc ion is found in higher concentrations in the tears than in plasma

Back 10

Cl-

Front 11

the role PS innervation plays in nasolacrimal system includes

Back 11

increase of secretion from lacrimal gland

Front 12

what is the primary source of oxygen for avascular cornea

Back 12

tear film

Front 13

protein lactroferrin is an important component of secretion from the

Back 13

lacrimal gland

Front 14

which is a normal aging change in cornea

Back 14

endothelial cell density decreases

Front 15

the NAK pump located in basolateral membrane of corneal endothelial cell

Back 15

moves Na out of cell into intracelluar space

Front 16

movement of Cl ions out of corneal epi into tear film occurs primarily by

Back 16

choride channels in apical membrane of surface cell

Front 17

water content of corneal stroma is

Back 17

78%

Front 18

maximal light transmittance through corneal stroma occurs b/c spacing b/w components

Back 18

is less than one half the wavelength of visible light

Front 19

what mechanism is most important in counteracting the leakage of fluid into corneal stroma through endothelium

Back 19

NaK ATPase pump in basolateral endo membrane

Front 20

reduction in IOP measurement caused by sustained accomodation occurs b/c of

Back 20

decrease in outflow resistance

Front 21

majority of aqueous exits eye through

Back 21

corneoscleral meshwork and schlemm canal

Front 22

which processes used by ciliary epi accounts for majority of aqueous formation

Back 22

secretion

Front 23

highest resistance to aqueous outflow is located in the

Back 23

juxtacanalicular tissue

Front 24

whihc is in a higher concentration in aqueous than in blood plasma

Back 24

ascorbate

Front 25

where do pregang PS fibers that carry the info resulting accomodation originate

Back 25

Edinger Westphal accessory 3rd nerve nucleus

Front 26

an indirect acting adrengeric agonists acts

Back 26

by causing postgang fiber to release its neurotransmitter

Front 27

what effect does a lestion that damages all of fibers from pretectal nuclei to left EW nucleus have on near pupillary response

Back 27

none, near pupillary response will be normal OU

Front 28

cause of afferent pupillary defect accompanied by homonymous VF defect

Back 28

optic tract

Front 29

protein content of lens

Back 29

increases from superficial fibers to deep fibers

Front 30

a dilute solution of topical adrenergic agonists will cause sphincter contraction w/ damage to the

Back 30

ciliary ganglion

Front 31

which is found in higher concentration in mature lens fiber

Back 31

crystallins

Front 32

glutathione is found w/in the lens and its fxn is

Back 32

protection against oxidate damage

Front 33

one of major causes of age related changes in lens is

Back 33

oxidative damage from UV

Front 34

what of condition of pupil during sleep

Back 34

miotic

Front 35

PS stimulation of ciliary body will result in

Back 35

release of tension in zonules

Front 36

what best describes role of iris in blood-aqueous barrier

Back 36

nonfenestrated iris capillaries contain zonula occludens

Front 37

with age, the percentage of liquid vitreous increase relative to gel component b/c of

Back 37

redistribution of hylauroinc acid w/in vitreous

Front 38

the vitreous is 99% water b/c of

Back 38

anionic hyalauronic acid molecules

Front 39

in dark current, retinal rods

Back 39

have outer segment membrane that is leaky to Na

Front 40

what neurotransmitter is released at cone pedicle

Back 40

glutamate

Front 41

difference b/w rod and cone disc componets is

Back 41

protein component, opsin

Front 42

the 1st cell in visual pathway that exhibits a center surround recpetive field is the

Back 42

bipolar cell

Front 43

which step is part o rod renewal system

Back 43

disc componets cloghed at tip and phagocytosed by RPE

Front 44

receptive field of retinal ganglion cell

Back 44

can be expanded by horizontal cell involvement

Front 45

a lesion involving the right optic tract will most likely result in

Back 45

left homoonymous hemianopia

Front 46

on which retinal area will a target be seen in superior temporal field by left eye by imaged

Back 46

infeior nasal

Front 47

which EOM causes elevation w/ eyes in right gaze

Back 47

right superior rectus

Front 48

what muscles are yoke muslces resulting in depressed left gaze

Back 48

right sup oblique and left inf rectus

Front 49

what EOM causes intorsion

Back 49

sup oblique and sup rectus

Front 50

what mechanism accoutns for coordination of yoke muslces in left-right gaze

Back 50

internuclear neurosn in abducens nucleus

Front 51

how does EOM differ from typical vertebrate striated muscle

Back 51

eom has fewer muscle fibers per motor neuron than does skeletal muscle

Front 52

herring's law of equal innervation refers to the

Back 52

equal innervation necessary for conjugate yoked eye movements