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VISUAL SYSTEM
I. TRUE or FALSE. Circle the correct letter.
T F 1. Axons of retinal ganglion cells synapse in the striate cortex.
T F 2. Light depolarizes photoreceptors, bipolars and ganglion cells to produce the
sensation of vision.
T F 3. The lens is the main refracting element of the eye.
T F 4. Photopic vision refers to vision mediated by the eye in relatively bright,
daylight conditions.
T F 5. The antagonistic surrounds of ganglion-cell receptive fields are largely
attributable to the lateral inhibitory circuitry involving the horizontal
cells.
T F 6. In the cat retina, ganglion cells of the X-cell class have smaller receptive fields
and more tonic (sustained) light responses that do Y cells.
T F 7. The ON and OFF channels of the retina can be traced to two different classes
of bipolar cells with opposing responses to the photoreceptor transmitter.
T F 8. In humans, retinal ganglion cells lying in the temporal hemiretina send their
axons to the contralateral hemisphere by decussating at the optic chiasm.
II. MULTIPLE CHOICE. Circle every correct answer. There may be more than one
correct answer per question.
1. Visual acuity is degraded by each of the following
a.
b.
c.
d.
damage to the fovea of the retina
eliminating the air/cornea interface by immersing the eye in water
dilating the pupil with topical application of drugs
distorting the shape of the eyeball
2. The visual field defect produced by transection of the optic chiasm in humans is
called
a.
b.
c.
d.
homonymous superior quadrantanopia
bitemporal hemianopia
binasal hemianopia
bilateral homonymous hemianopia
3. The layers of the lateral geniculate nucleus serve to segregate afferents
a.
b.
c.
d.
from the cortex from those of arising from the retina
from different ganglion cell classes
from different eyes
from the two optic tracts
4. Axons of retinal ganglion cells synapse in
a.
b.
c.
d.
e.
medial geniculate nucleus
lateral geniculate nucleus
superior colliculus
inferior colliculus
visual cortex
5. The optic disc of the retina corresponds to the
a.
b.
c.
d.
e.
fovea
pupil
blind spot
shadow of the lens
visual axis
IV. Label the indicated structure or region in the eye.
V. In the space provided beside each pair of visual fields, write the numbers of the lesion
or the combination of lesions which produce the defect. (OS = left eye; OD = right
eye).
VISUAL SYSTEM
I. True/False
1.
2.
3.
4.
5.
F
F
F
T
T
6. T
7. T
8. F
II. Multiple choice
1.
2.
3.
4.
5.
IV. Ocular Anatomy
V. Field defects.
A. 2
B. 3
C. 1 + 3
D. 1 + 2
E. 2 + 3
a,b,c,d
b
b,c
b,c
c
III. Matching
1.
2.
3.
4.
5.
S
D
N
J
A
6. L
7. R
8. Q
9. O
10. H