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PART 1 > Retina > Flashcards

Retina Flashcards

1
Q

How many parts make up the retina? (2)

A

Inner neurosensory retina

Outer retinal pigment epithelium (RPE)

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2
Q

Surface area of retina?

A

1250 mm2

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3
Q

Diameter of Maculea lutea?

A

1.5 mm

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4
Q

What blocks UV light in the macula?

A

xanthophyll carotenoid pigment

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5
Q

What is the thickest area in the retina?

A

the peripapillary region (230 um)

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6
Q

Where is the peripheral retina thinner? (Nasal or temporal)

A

Temporal retina thinner than nasal retina

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7
Q

What is RPE made of?

A

A continous layer of hexagonal cuboidal cells

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8
Q

What forms the outer blood-retinal barrier?

A

The fused plasma membranes in the zonulae occludentes (in the RPE)

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9
Q

What is a waste product of the RPE that increasses with aging?

A

lipofucin

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10
Q

Where is te highest density of lipofuscin in RPE?

A

In the macula

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11
Q

What are the 3 neuron cells that relay light generated impulses

A

photoreceptors + bipolar cells + ganglion cells

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12
Q

what modulates the activity of the neuron light cells?

A

horizontal cells and amacrine cells

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13
Q

What is the rods to cones ratio?

A

20:1

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14
Q

What are the layers of the retina ( 10) Inner to outer?

A
  1. Retinal pigment epithelium
  2. Photoreceptor layer
  3. external limiting membrane
  4. outer nuclear layer
  5. outer plexiform layer
  6. inner nuclear layer
  7. inner plexiform layer
  8. ganglion cell layer
  9. retinal nerve fibre layer
  10. Internal limiting membrane
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15
Q

Retinal blood supply?

A

Inner 2/3rds –> Central retinal artery

Outer 1/3rd –> choroidal vessels

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16
Q

What provides an anastomosis between the retinal and choroidal circulation?

A

Ciolioretinal artery (branch of posterior ciliar vessels)

17
Q

what makes up the inner blood retinal barrier?

A

retinal capillaries endothelium - non leaky tight junctions

18
Q

where does the central retinal vein drain?

A

cavernous sinus or sometimes the superior ophthalmic vein

19
Q

Which layers seperate in retinal detachemnt

A

the neurosensory layer (photorecptor layer) from the RPE

PART 1 (11 decks)

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