ON

Question 1

On is extension of what part of the brain

Answer 1

Diencephalon

Question 2

Neuro retinal rim tissue

Answer 2

Optic disc

Question 3

Contains the retinal ganglion cells that constitute the neurosensory retina coalescing at the ON

Answer 3

Optics disc

Question 4

The absence of retinal nerve fiber cells

Answer 4

Optic cup

Question 5

Common C/D ratios

Answer 5

0.2-0.4

Question 6

Midget cells

Answer 6

Parvocellular pathway
What it is
Finer resolution

Question 7

Midget cells project to the ___ and connect with ____

Answer 7

LGN

Connect w midget bipolar cells that connect with few, photoreceptors

Question 8

80% (most) of retinal ganglion cells are

Answer 8

Midget cells (what it is pathway)

Question 9

Parasol cells

Answer 9

Magnocellular pathway
Where it is
Motion detection

Question 10

Need to communicate with many receptors for their function

Answer 10

Parasol cells because of the larger area of reference

Question 11

What RGC are preferentially prone to glaucoma damage?

Answer 11

Parasol cells

Question 12

30% of >1 million RGCs are reserved solely for

Answer 12

The central 8 degrees of the macula around the fovea

Question 13

Papillomacular nerve fiber bundles

Answer 13

Include fovea & macula areas, straight horizontal

Question 14

Arcuate nerve fibers

Answer 14

Located superior and inferior temporally in the retina coursing around the fovea delineated by the horizontal Raphe

Question 15

Nasal nerve fibers

Answer 15

Radial course for the vast temporal fields of our peripheral vision

Question 16

Glaucoma respects

Answer 16

Horizontal

Question 17

Lamina cribosa is a threshold of fenestrations found

Answer 17

Posteriorly where RGC axons and astrocytes binder to carry into to CNS

Question 18

Site of CRA and CRV entering the optics nerve

Answer 18

Lamina cribosa

Question 19

Where does myelination begin in lamina cribosa

Answer 19

Posteriorly

Question 20

Trans lamina cribrosa pressure

Answer 20

Difference on IOP and ICP

Norm is <5mmHg

Question 21

SVP is only seen when

Answer 21

Trans laminar pressure is overall normal

Question 22

True papilledema etiology stems from

Answer 22

Increased CSF

Question 23

High ICP can be from retrobulbar increase in CSF or introrbital/cranial space lesion can result in

Answer 23

Swollen/elevated ONH

Papilledema

Question 24

This portion of the optic nerve is surrounded by myelination at the micro level of the axons and meninges at the macro level of the nerve

Answer 24

Retro lamina intraorbital