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Ocular Block 8 > Optic Nerve > Flashcards

Optic Nerve Flashcards

(53 cards)

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1
Q

The optic nerve is always (nasal/temporal)

A

Nasal

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2
Q

How many retinal ganglion cells are there in the RGCL

A

1.2-2.2 million

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3
Q

What is the function of the retinal ganglion cells

A

Output (3rd order neuron) of the retina

Conveys all processed visual info to the brain

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4
Q

What forms the retinal nerve fiber layer

A

Axons of the retinal ganglion cells

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5
Q

The majority of optic Erie fibers have what diameter

A

1 um.

Small percent has 2-10um

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6
Q

What nervous system is CN2 part of

A

CNS

It is a part of the brain

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7
Q

What is the importance of the optic nerve benign a part of the CNS

A

It is prone to many neurological diseases

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8
Q

What are the 4 divisions of the optic nerve

A
  1. Intraocular
  2. Intraorbital
  3. Intracanalicular
  4. Intracranial
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9
Q

Approximately how long is the optic nerve

A

4-5 cm

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10
Q

How is the optic cup displaced

A

Slightly temporal from the center of the disc

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11
Q

Are there nerves in the optic cup

A

No

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12
Q

What is contained in the neuroretinal rim

A

Nerve fibers

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13
Q

The thickness of the neuroretinal rim varies. What is it from thickest to thinnest

A

Inferior
Superior
Nasal
Temporal

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14
Q

What is the cup-disc ratio used for

A

To compare the diameter of the cup with the overall diameter of the optic disc.
Used to assess changes in the neuroretinal rim thickness over time

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15
Q

The central retinal vessels emerge from what side of the cup

A

Nasal side

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16
Q

What are the 2 divisions of the intraocular portion of the optic nerve

A

Pre-laminar

Laminar

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17
Q

What are the layers of the pre-laminar portion of the optic nerve

A

Retinal and choroidal layer

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18
Q

What is located in the retinal layer

And why?

A

Optic disc, because it is the atonal fibers of the retina ganglion cells that converge to form it

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19
Q

What is at the level of the choroidal layer of the optic nerve

A

The choroidal tunic

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20
Q

Where does the lamina cribrosa begin

A

Outermost part of the choroidal layer of the optic nerve and continues into the scleral layer of the optic nerve

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21
Q

What is the meniscus of Kuhnt

A

Glial plaque that lines the optic cup

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22
Q

What is the inner limiting membrane of Elschnig

Study These Flashcards
A

Peripheral continuation of the Meniscus of Kuhnt that lines the surface of the neuroretinal rim

23
Q

What is the inner limiting membrane of the retina

Study These Flashcards
A

Formed by footplates of the Muller cells, continuous with the inner limiting membrane of Elschnig

24
Q

What is the intermediary tissue of Kuhnt

Study These Flashcards
A

Glial tissue that separates outer retina from bundles of optic nerve fibers

25
What is the border tissue of Elschnig
Collagen separating choroid from bundles of optic nerve fibers
26
What is the border tissue of Jacoby
Glial tissue situated between border tissue of Elschnig and bundles of optic nerve fibers. Merges with intermediary tissue of Kuhnt
27
What forms a Bergmeister's Papilla
Remnant of Meniscus of Kuhnt tissue surrounding the Hyaloid vasculature during development
28
What is the optic cup size at birth related to
Disc size | Reabsorption of glial tissue surrounding hyaloid vasculature
29
What layer makes up the laminar portion of the optic nerve
Scleral layer
30
What is the scleral layer of the optic nerve continuous with
Scleral tunic of the eyeball
31
What is contained in the scleral layer of the optic nerve
Lamina cribrosa
32
T/F Myelin increases the diameter of retrobulbar optic nerve
True
33
What do astrocytes do in the optic nerve
Form thick columns that keep the axonal fibers organized into bundles in the optic nerve
34
Where does the intraorbital portion of the optic nerve originate
25 mm from the sclera to the apex of the orbit
35
Why is the intraorbital portion of the optic nerve thicker How much does the thickness increase
Myelin 1.5mm -> 3-4 mm in diameter
36
What is optic nerve sheath continuous with
The meninges of the brain
37
What are the layers of the optic nerve whether from superficial to deep
Dura Arachnid Pia
38
What do all 3 layers of the optic sheath fuse with
Scleral
39
What is papilledema
Bilateral swelling of the optic disc caused by elevated intracranial pressure in the subarachnoid space Slide 29
40
What is pseduopapilledema
Blurred disc drusen | Slide 30
41
How long is the intracanalicular portion of the optic nerve
5 mm
42
What does the intracanalicular portion of the optic nerve pass through What accompanies it?
The lesser wing of the sphenoid via optic canal Ophthalmic artery
43
What is the subarachnoid space of the optic nerve continuous with
The subarachnoid space of the brain
44
At the apex of the orbit what does the optic nerve reside in
The common annular tendon | Annulus of Zinn
45
How long is the intracranial portion of the optic nerve
10 mm
46
What is the path of the optic nerve once it leaves the optic canal
Passes in the subarachnoid space of the brain, merges with the nerve fibers from the contralateral optic nerve at the optic chiasm
47
How does the central retinal artery run
Along the optic nerve
48
What supplies the retinal layer of the optic disc
Retinal capillaries
49
What supplies the lamina cribrosa and adjacent plial plexus
Arterial circle of Zinn-Haller | Short posterior ciliary arteries
50
Where does the central retinal artery enter the eye
Through an aperture in the lamina cribrosa
51
How is the central retinal artery positioned
Nasal to the central retinal vein
52
Look at the clinical correlates at the end of the lecture
Notes on slides
53
What is the venous drainage of the optic nerve
Central retinal vein

Ocular Block 8 (4 decks)

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