Cranial Nerve II

Question 1

Cranial Nerve II

Answer 1

optic nerve

Question 2

Optic nerve is sensory or motor?

Answer 2

SENSORY ONLY

Question 3

the eye is composed of which three layers?

Answer 3

Fibrous tunic, Vascular tunic, Retina

Question 4

Outermost layer of eye

Answer 4

fibrous tunic

Question 5

middle layer of eye

Answer 5

vascular tunic

Question 6

innermost layer of eye

Answer 6

retina

Question 7

fibrous tunic consists of

Answer 7

sclera and cornea

Question 8

vascular tunic consists of

Answer 8

ciliary body, iris and choroid

Question 9

bipolar cell bodies are found in which layer of the retina?

Answer 9

inner nuclear layer

Question 10

bipolar cells relay information to which cells?

Answer 10

ganglion cells

Question 11

In which layer do bipolar cells synapse with ganglion cells?

Answer 11

inner plexiform layer

Question 12

depolarized photoreceptors relay information to bipolar cells by synapsing in which layer?

Answer 12

outer plexiform layer

Question 13

what are the three types of cones?

Answer 13

red, green, blue

Question 14

what is required for the cones to function properly?

Answer 14

adequate light

Question 15

where are cones located?

Answer 15

center of retina (fovea)

Question 16

the periphery of retina is almost completely composed of…

Answer 16

rods

Question 17

are optic nerve axons myelinated?

Answer 17

yes, oligodendrocytes form the myelin

Question 18

axons from ganglion cells are conveyed in which layer?

Answer 18

nerve fiber layer

Question 19

which fibers cross over in the chiasma?

Answer 19

ganglion cell axons originating from the medial/nasal half of retina

Question 20

what are the three nuclei of termination for optic tract fibers?

Answer 20

lateral geniculate body, superior colliculus, pretectal nucleus of the midbrain

Question 21

vision pathway

Answer 21

1. photoreceptors
2. bipolar cells
3. ganglion cell
4. cell body in lateral geniculate body (thalamus)
5. neuron cell body in brodmann area 17

Question 22

lesion of optic nerve will lead to

Answer 22

loss of depth perception

Question 23

lesion of optic chiasma will lead to

Answer 23

loss of peripheral vision

Question 24

lesion of optic tract will lead to

Answer 24

loss of half visual field on OPPOSITE side

Question 25

which photoreceptor sense only light vs. dark?

Answer 25

rods

Question 26

which photoreceptor receives color information?

Answer 26

cones

Question 27

layers of the retina

Answer 27

pigmented layer, photosensitive outer segment, external limiting membrane, outer nuclear layer, outer plexiform layer, inner nuclear layer, inner plexiform layer, ganglion cell layer, nerve fiber layer, internal limiting membrane

Question 28

which layer contains rod and cone cell bodies?

Answer 28

outer nuclear layer

Question 29

are retinal ganglion cell axons myelinated?

Answer 29

NO