The Retina

Question 1

Location

Answer 1

Lines between the choroid and the vitreous, lining the posterior 2/3 of the globe and extending from the ora serrata to the optic nerve

Question 2

Function

Answer 2

To convert light into neural impulses and sends down the visual pathway

Question 3

Gross structure (3 features)

Answer 3

Highly vascular membrane that lines 2/3 of the globe

Made up of 8 layers

Peripheral retina starts at the ora serrata

Question 4

Dimensions: Macula

Answer 4

5.5mm wide

Question 5

Dimensions: Fovea

Answer 5

1.5mm wide

Question 6

Dimensions: Foveola

Answer 6

0.35mm wide

Question 7

Dimensions: Optic Nerve Head

Answer 7

1.5mm wide and 1mm tall

Question 8

Central Retina: Macula

Answer 8

3mm lateral to optic disc

Question 9

Central Retina: Fovea

Answer 9

Central depression in macula

Question 10

Central Retina: Foveola

Answer 10

Thinnest and most sensitive part of retina

Question 11

Name of layer 1

Answer 11

Retinal Pigment Epithlium

Question 12

Name of layer 2

Answer 12

Photoreceptors

Question 13

Name of layer 3

Answer 13

Outer Nuclear Layer

Question 14

Name of layer 4

Answer 14

Outer Plexiform Layer

Question 15

Name of layer 5

Answer 15

Inner Nuclear Layer

Question 16

Name of layer 6

Answer 16

Inner Plexiform Layer

Question 17

Name of layer 7

Answer 17

Ganglion Layer

Question 18

Name of layer 8

Answer 18

Retinal Nerve Fibre Layer

Question 19

Function: Pigment Epithelium (4 points)

Answer 19

• Absorbs stray light
• Pathway for nutrients from choroid to receptors
• Waste removal
• Support for photoreceptor cells

Question 20

Thickness: Pigment Epithelium

Answer 20

Single layer of densely packed cuboidal cells

Question 21

Pigment Epithelium contains… (4 points)

Answer 21

Microvilli
Endoplasmic reticulum
Mitochrondria
Melanin granules