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PNS > Exam 1: Optic Nerve > Flashcards

Exam 1: Optic Nerve Flashcards

1
Q

3 layers of eye

A

Fibrous tunic
Vascular tunic
Retina

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2
Q

Parts of fibrous layer

A

Sclera

Cornea

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3
Q

Parts of vascular tunic

A

Ciliary body
Iris
Choroid

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4
Q

Layers of retina

A
  1. Pigmented
  2. Photosensitive outer segment
  3. External limiting membrane
  4. Outer nuclear
  5. Outer plexiform
  6. Inner nuclear
  7. Inner plexiform
  8. Ganglion cell
  9. Nerve fiber
  10. Internal limiting membrane
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5
Q

Pigmented layer adjacent to

A

Choroid

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6
Q

Photosensitive outer segment has

A

Rods

Cones

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7
Q

Outer nuclear layer contains

A

Rod and cone cell bodies

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8
Q

Outer plexiform layer: rods and cones synapse with

A

Bipolar cells

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9
Q

Inner nuclear layer contains

A

Bipolar cell bodies

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10
Q

Inner plexiform layer: bipolar cells synapse with

A

Ganglion cells

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11
Q

Ganglion cell layer contains

A

Ganglion cell bodies

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12
Q

Nerve fiber layer contains

A

Retinal ganglion cell axons

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13
Q

Retinal ganglion cell axons are ____

A

NOT myelinated

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14
Q

Internal limiting membrane is glial boundary separating

A

Retina from vitreous body

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15
Q

3 layers of cell bodies in eye

A

Rods/cones
Bipolar cells
Ganglion cells

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16
Q

Layers of retina with synaptic activity

A

Outer plexiform

Inner plexiform

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17
Q

___ require light to function

A

Cones

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18
Q

Cones concentrated in

A

Fovea centralis

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19
Q

Cones sense

A

Color

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20
Q

Types of cones

A

Red
Green
Blue

21
Q

Rods sense

A

Light vs dark

22
Q

Rods present where in retina

A

Periphery

23
Q

Color blindness is ____

A

Sex linked

24
Q

Bipolar cell bodies found in

A

Inner nuclear layer

25
Q

Bipolar cells synapse in

A

Inner plexiform layer

26
Q

Optic disc has ___ receptors

A

None

27
Q

Optic disc is considered to be the

A

Blind spot

28
Q

Optic nerve enters skull through

A

Optic canal

29
Q

Optic nerves unite to form

A

Optic chiasma

30
Q

Are nerve fiber layer axons myelinated

A

NO

31
Q

Are optic nerve axons myelinated

A

Yes

32
Q

What cells form myelin

A

Interfascicular oligodendrocytes

33
Q

Which fibers of the retina will cross

A

Medial side

34
Q

Optic tract travels around

A

Cerebral peduncles

35
Q

Majority of optic tract fibers synapse on

A

Lateral geniculate body

36
Q

3 possible nuclei of termination for the optic tract fibers

A

LGB
Superior colliculus
Pretectal nucleus

37
Q

BM area of vision

A

BM 17

38
Q

Fibers synapsing in superior colliculus relay info to

A

Tectospinal tract

39
Q

2 muscles influenced by tectospinal tract

A

SCM

Trapezius

40
Q

Fibers of the pretectal nucleus deal with

A

Light reflexes

41
Q

Vision is a ___ neuron pathway

A

4

42
Q

Lesion of optic nerve

A

Lose depth perception

Lose binocular vision

43
Q

Lesion of optic chiasma

A

Tunnel vision (lose peripheral)

44
Q

Lesion of optic tract

A

Lose half of visual field

45
Q

Afferent component of visual reflexes is controlled by

A

CN 2

46
Q

Lens changes shape due to

A

ciliaris (CN3)

47
Q

Which visual reflex is CN2 not involved with

A

Corneal reflex

48
Q

Lens changes to be more __ when looking at close objects

A

Convex

49
Q

Corneal reflex uses CN __ and ___

A 
CN 3 (somatic)
CN 5 (V1)

PNS (24 decks)

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