Cranial Nerve II Flashcards

1
Q

Cranial Nerve II

A

optic nerve

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2
Q

Optic nerve is sensory or motor?

A

SENSORY ONLY

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3
Q

the eye is composed of which three layers?

A

Fibrous tunic, Vascular tunic, Retina

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4
Q

Outermost layer of eye

A

fibrous tunic

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5
Q

middle layer of eye

A

vascular tunic

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6
Q

innermost layer of eye

A

retina

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7
Q

fibrous tunic consists of

A

sclera and cornea

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8
Q

vascular tunic consists of

A

ciliary body, iris and choroid

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9
Q

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

A

inner nuclear layer

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10
Q

bipolar cells relay information to which cells?

A

ganglion cells

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11
Q

In which layer do bipolar cells synapse with ganglion cells?

A

inner plexiform layer

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12
Q

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

A

outer plexiform layer

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13
Q

what are the three types of cones?

A

red, green, blue

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14
Q

what is required for the cones to function properly?

A

adequate light

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15
Q

where are cones located?

A

center of retina (fovea)

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16
Q

the periphery of retina is almost completely composed of…

17
Q

are optic nerve axons myelinated?

A

yes, oligodendrocytes form the myelin

18
Q

axons from ganglion cells are conveyed in which layer?

A

nerve fiber layer

19
Q

which fibers cross over in the chiasma?

A

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

20
Q

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

A

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

21
Q

vision pathway

A
  1. photoreceptors
  2. bipolar cells
  3. ganglion cell
  4. cell body in lateral geniculate body (thalamus)
  5. neuron cell body in brodmann area 17
22
Q

lesion of optic nerve will lead to

A

loss of depth perception

23
Q

lesion of optic chiasma will lead to

A

loss of peripheral vision

24
Q

lesion of optic tract will lead to

A

loss of half visual field on OPPOSITE side

25
which photoreceptor sense only light vs. dark?
rods
26
which photoreceptor receives color information?
cones
27
layers of the retina
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
28
which layer contains rod and cone cell bodies?
outer nuclear layer
29
are retinal ganglion cell axons myelinated?
NO