Quiz 6

Front 1

a

Back 1

optic nerve - comprised of axons from retinal ganglion cells

Front 2

b

Back 2

optic chiasm - decussation of the optic nerve axons

Front 3

c

Back 3

optic tract

Front 4

d

Back 4

lateral geniculate nucleus/body (LGN)

-termination of axons in the optic tract

-thalamic nucleus for vison

Front 5

e

Back 5

optic (visual) radiation fibers - projections from LGN --> primary visual cortex through the posterior limb of the internal capsule

Front 6

The superior colliculus receives fibers for _______

Back 6

visual reflexes

Front 7

Brachium of the superior colliculus contains ________ fibers passing to the __________ area and _____________

Back 7

Optic tract fibers
Pretectal area
Superior colliculus

Front 8

a

Back 8

calcarine fissure/sulcus

Front 9

b

Back 9

cuneus gyrus

Front 10

c

Back 10

lingual gyrus

Front 11

purple

Back 11

Primary visual cortex - the calcarine cortex

Front 12

1

Back 12

optic chiasm

Front 13

2

Back 13

optic tract

Front 14

3

Back 14

lateral geniculate nucleus/body (LGN)

-major thalamic nucleus that relays visual stimuli to cortex

Front 15

a-d (red) pathway

Back 15

Visuomotor (pupillary light) reflex pathway
- afferent pathways carrying light info via (a) optic nerve

Front 16

a (red)

Back 16

optic nerve

Front 17

b (red)

Back 17

optic chiasm

Front 18

c (red)

Back 18

optic tract

Front 19

d (red)

Back 19

pretectal nucleus of midbrain - (lateral to PAG)

-Synaptic center relaying info about light reflexes

Front 20

A-D (blue)

Back 20

efferent pathway

Front 21

A (blue)

Back 21

Edinger-Westphal nucleus
-oculomotor nucleus complex of midbrain

- preganglionic parasym cell bodies

Front 22

Edinger-Westphal nucleus : receives fibers from _______ and ________ and sends axons via CN ___________ for _______ constriction and lens ________

Back 22

-pretectal area and superior colliculus
-CN 3 (oculomotor n)
-pupillary constriction and lens accommodation

[This nucleus sends efferent axons that synapse in the ciliary ganglion.]

Front 23

B (blue)

Back 23

oculomotor nerve (efferent limb)

Front 24

C (blue)

Back 24

ciliary ganglion
-postganglionic parasym cell bodies

Front 25

D (blue)

Back 25

axons to constrictor pupillae

Front 26

Oculomotor nerve fibers: axons from the ___________ to the ___________

Back 26

Edinger-Westphal nucleus to the Ciliary ganglion

Front 27

Visual acuity tests for

Back 27

near versus distance vision

Front 28

Visual fields test plots

Back 28

visual field maps for each eye

Front 29

1 (ppt picture)

Back 29

optic chiasm

Front 30

2

Back 30

optic tract

Front 31

3

Back 31

lateral geniculate nucleus (LGN)

Front 32

4

Back 32

Optic radiation

Front 33

5

Back 33

Striate cortex

Front 34

Blue arrow

Back 34

Lateral geniculate nucleus of thalamus

Front 35

Red arrow

Back 35

Superior colliculus

Front 36

Scotoma

Back 36

loss of part of a visual field of an eyeball

Front 37

Hemianopia/hemianopsia

Back 37

loss of half the visual field

Front 38

Quadranopia

Back 38

loss of a quarter of the visual field

Front 39

Homonymous

Back 39

loss of the same part of visual field in both eyes

Front 40

Heteronymous

Back 40

loss in different part of visual field for two eyes

Front 41

A (visual field deficits)

Back 41

Soctoma: Blindness in one eye

Front 42

B

Back 42

Bi-Temporal hemianopia:
loss of half the visual field

Front 43

C

Back 43

Homonymous Hemianopia:
loss of the same part of visual field in both eyes

Front 44

D

Back 44

Quadrantanopsia:
loss of a quarter of the visual field

Front 45

1-4 (Horizontal section through eye)

Back 45

Refraction Media of the Eye
-photons of light must pass through before activating cells within the retina

Front 46

1

Back 46

Cornea

Front 47

2

Back 47

Aqueous humor

Front 48

3

Back 48

Lens

Front 49

4

Back 49

Vitreous body

Front 50

a is what layer of the eye

Back 50

sclera (pigmented [tapetum lucidum] in cows not humans)

Front 51

b is what layer of the eye

Back 51

choroid

Front 52

c is what layer of the eye

Back 52

retina

Front 53

d is what layer of the eye

Back 53

ciliary body w/muscle

Front 54

e is what layer of the eye

Back 54

iris - divides space b/w aq humor into anterior and posterior chambers

Front 55

External or fibrous tunic/layer: consisting of the ______ and _______

Back 55

cornea and sclera

Front 56

Middle or vascular tunic/layer: consisting of the _____, _______, and _______

Back 56

iris, ciliary body, and choroid

Front 57

Internal tunic/layer: consisting of the _______

Back 57

retina

Front 58

Lens is held in position by the ____________

Back 58

suspensory ligaments

Front 59

1 (bovine eyeball)

Back 59

cornea

Front 60

2

Back 60

suspensory ligaments

Front 61

3

Back 61

tapetum lucidum (TL):

provides a surface that reflects light within the vitreous chamber and back onto the retina to enhance sensitivity as an adaption to functioning in low-light conditions. (cat glow)

Front 62

4

Back 62

optic nerve

Front 63

Damage to which nervous structure (A-D) would lead to an absence of the efferent limb of the pupillary reflex , select all that apply.

Back 63

A (Edinger-Westphal nucleus) and D (axons to constrictor pupillae)

Front 64

1

Back 64

Edinger-Westphal nucleus

Front 65

2

Back 65

Oculomotor nucleus (3)

Front 66

3

Back 66

Oculomotor nerve fibers

Front 67

Glaucoma results from abnormal drainage of _________ characterized by an increase in _________. If untreated can lead to damage of ________ and blindness.

Back 67

aqueous humor
intraocular pressure
retinal neurons

Front 68

Contraction of the ciliary muscle (increase/decrease) the tension on the ligaments of the _____ to round (aka: _________)

Back 68

Decrease
lens
accommodation

Front 69

The inner layer, the ______, contains the light-detecting cells of the eye and is closely associated with the choroid.

Back 69

retina