USAHS NEUROSCIENCE EXAM #3
QUESTIONS AND ANSWERS
What is the central fixation for each eye w the highest visual acuity? - ANSWER -fovea
This surrounds the fovea and also has a relatively high visual acuity? - ANSWER -
macula
This area is formed by axons leaving the retina and has no photoreceptors - ANSWER -
optic disc
15 degs lateral temporal is known as your what? - ANSWER -blind spot
What are the 3 layers of the retina? - ANSWER -outmost layer
biplor layer
innermost layer
What layer contains rods and cones? - ANSWER -outermost
Do rods or cones provide low resolution visual images? - ANSWER -rods
Are there more rods or cones? - ANSWER -rods
Which one does not detect color? - ANSWER -rods
Are rods or are cones located more periphery in the retina? - ANSWER -rods
Are rods or are cones located in the fovea and macula? - ANSWER -cones
Are rods or are cones high resolution visual images? - ANSWER -cones
After light enters the lens to the retina, what is the pathway through the layers of retina
to the optic nerve? - ANSWER -Photoreceptors respond to light in receptive fields and
form excitatory or inhibitory synapses—to bipolar cells - and sends it to the ganglion
cells—where it sends it to the optic nerve
What are the two types of ganglion cells in the innermost layer? - ANSWER -a. Parasol
cells aka A cells, p-alpha
b. Midget cells aka B cells, p-beta
, What ganglion cells respond to gross stimulus features and mvmt and where to they
project to? - ANSWER -a. Parasol cells
b. Project to magnocellular layer in LGN
What ganglion cells responds to very fine visual details and color? And what layer does
it project to? - ANSWER -Midget cells and parvocellular layers in LGN
T/F the medial geniculate nucleus is associate w the visual pathway - ANSWER -a.
False
b. LGN is associated w visual pathway
Optic nerve receives input from what? - ANSWER -the ganglion cells
T/F the visual field of the right eye is carried by the right optic nerve? - ANSWER -true
What is susceptible to compression by pituitary tumor? - ANSWER -optic chiasm
T/F the optic chiasm receives visual input from the nasal side? - ANSWER -a. False
b. It receives visual input from the temporal side
What are the nasal fibers responsible for? - ANSWER -the temporal part of the visual
field
Damage to the optic chiasm will cause what? - ANSWER -a. Bitemporal hemianopsia
b. Aka tunnel vision
The R optic tract is carrying info from R/L fibers which is R/L visual field. Does this apply
to one eye or both? - ANSWER -R fibers
L visual field
both eyes
If there was damage to the R tract, what will it cause? - ANSWER -Contralateral
homonymous hemianopsia of L visual field
Give me the pathway from the temporal visual field of the R eye to the optic tract: -
ANSWER -Temporal R visual field-
L nasal fibers-
R optic nerve -
optic chiasm -
L optic tract
QUESTIONS AND ANSWERS
What is the central fixation for each eye w the highest visual acuity? - ANSWER -fovea
This surrounds the fovea and also has a relatively high visual acuity? - ANSWER -
macula
This area is formed by axons leaving the retina and has no photoreceptors - ANSWER -
optic disc
15 degs lateral temporal is known as your what? - ANSWER -blind spot
What are the 3 layers of the retina? - ANSWER -outmost layer
biplor layer
innermost layer
What layer contains rods and cones? - ANSWER -outermost
Do rods or cones provide low resolution visual images? - ANSWER -rods
Are there more rods or cones? - ANSWER -rods
Which one does not detect color? - ANSWER -rods
Are rods or are cones located more periphery in the retina? - ANSWER -rods
Are rods or are cones located in the fovea and macula? - ANSWER -cones
Are rods or are cones high resolution visual images? - ANSWER -cones
After light enters the lens to the retina, what is the pathway through the layers of retina
to the optic nerve? - ANSWER -Photoreceptors respond to light in receptive fields and
form excitatory or inhibitory synapses—to bipolar cells - and sends it to the ganglion
cells—where it sends it to the optic nerve
What are the two types of ganglion cells in the innermost layer? - ANSWER -a. Parasol
cells aka A cells, p-alpha
b. Midget cells aka B cells, p-beta
, What ganglion cells respond to gross stimulus features and mvmt and where to they
project to? - ANSWER -a. Parasol cells
b. Project to magnocellular layer in LGN
What ganglion cells responds to very fine visual details and color? And what layer does
it project to? - ANSWER -Midget cells and parvocellular layers in LGN
T/F the medial geniculate nucleus is associate w the visual pathway - ANSWER -a.
False
b. LGN is associated w visual pathway
Optic nerve receives input from what? - ANSWER -the ganglion cells
T/F the visual field of the right eye is carried by the right optic nerve? - ANSWER -true
What is susceptible to compression by pituitary tumor? - ANSWER -optic chiasm
T/F the optic chiasm receives visual input from the nasal side? - ANSWER -a. False
b. It receives visual input from the temporal side
What are the nasal fibers responsible for? - ANSWER -the temporal part of the visual
field
Damage to the optic chiasm will cause what? - ANSWER -a. Bitemporal hemianopsia
b. Aka tunnel vision
The R optic tract is carrying info from R/L fibers which is R/L visual field. Does this apply
to one eye or both? - ANSWER -R fibers
L visual field
both eyes
If there was damage to the R tract, what will it cause? - ANSWER -Contralateral
homonymous hemianopsia of L visual field
Give me the pathway from the temporal visual field of the R eye to the optic tract: -
ANSWER -Temporal R visual field-
L nasal fibers-
R optic nerve -
optic chiasm -
L optic tract
