Ocular Anatomy Numbers

Question 1

How far from the limbus does the medial rectus insert

Answer 1

5.5mm

Question 2

How far from the limbus does the IR insert

Answer 2

6.5mm

Question 3

How far from the limbus does the LR insert

Answer 3

6.9mm

Question 4

How far from the limbus does the SR insert

Answer 4

7.7mm

Question 5

Where is the sclera the thinnest and how thin is it

Answer 5

Rectus insertions sites

0.3mm

Question 6

Where is the scleral the thickest and how thick

Answer 6

Posterior pole

1mm

Question 7

Where do the rectus muscles insert, anterior or posterior to the equator

Answer 7

Anterior

Question 8

Where do the obliques insert, anterior or posterior to the equator

Answer 8

Posterior

Question 9

Where are the obliques pure elevators/depressors

Answer 9

51-55 degrees to the nose

Question 10

Where are the SR/IR pure elevator/depressor

Answer 10

23 degrees to the ear

Question 11

What nerves run through the cavernous sinus

Answer 11

3,4,6,V1,VII

Question 12

Normal axial length

Answer 12

24mm

Question 13

Horizontal diameter of the eye

Answer 13

23.5mm

Question 14

Vertical diameter of the eye

Answer 14

23mm

Question 15

Lens anterior radius of curvature

Answer 15

8-14um (flat)

Question 16

Lens posterior ROC

Answer 16

5-8um (steep)

Question 17

PH of the lens

Answer 17

6.9

Question 18

Refractive index of the lens

Answer 18

1.41 in the center

1,38 at the surfaces

Question 19

Thickness of peripheral cornea

Answer 19

0.67mm

Question 20

CCT

Answer 20

0.55mm

Question 21

Posterior ROC or cornea

Answer 21

7.8 (flat)

Question 22

Posterior ROC of cornea

Answer 22

6.5 (steep)

Question 23

Horizontal diameter of the anterior cornea

Answer 23

11.7

Question 24

Vertical diameter of the anterior cornea

Answer 24

10.6

Question 25

Horizontal diameter of the posterior cornea

Answer 25

11.7

Question 26

Vertical diameter of the posterior cornea

Answer 26

11.7

Question 27

Layers of the cornea

Answer 27

``` Epithelium Bowmans Stroma Descemets Endothelium ```

Question 28

Corneal epithelium thickness

Answer 28

50um

Question 29

Bowmans thickness

Answer 29

15um

Question 30

Corneal stroma thickness

Answer 30

450um

Question 31

Descemets thickness

Answer 31

5-15um

Question 32

Corneal endothelium thickness

Answer 32

5um

Question 33

ROC of sclera

Answer 33

11.5mm

Question 34

Where is the sclera the weakest

Answer 34

Lamina cribrosa

Question 35

Normal pupil size

Answer 35

3-4mm

Question 36

Width of iris

Answer 36

12mm

Question 37

Thickness of the choroid at posterior pole

Answer 37

0.2mm

Question 38

Thickness of choroid at ora

Answer 38

0.1mm

Question 39

Thickness of bruchs

Answer 39

2um

Question 40

Volume of vitreous chamber

Answer 40

80% of globe, 4uL

Question 41

Water content of vitreous

Answer 41

98.5-99.7%

Question 42

Type I collagen

Answer 42

Bones Bowmans Stroma Sclera

Question 43

Type II collagen

Answer 43

Vitreous

Question 44

Type IV collagen

Answer 44

Descemets and BM

Question 45

Blood aqueous barrier

Answer 45

Iris (minor circle) NPCE AE (dilator) Schlemms canal

Question 46

Blood retinal barrier

Answer 46

``` RPE cells (between) Around retinal BV ```

Question 47

Where is the rod ring in the retina

Answer 47

5mm from the fovea

Question 48

How large is the fovea

Answer 48

1DD (1.5mm) | -5mm temporal, 0.4mm inferior to disc

Question 49

What wavelength for cyanolabe

Answer 49

440nm

Question 50

Wavelength for chlorolabe

Answer 50

535nm

Question 51

Wavelength for erythrolabe

Answer 51

565nm

Question 52

Layers of the LGN for parvo cells

Answer 52

3,4,5,6

Question 53

Layers of the LGN for magno cells

Answer 53

1, 2

Question 54

How many photoreceptors

Answer 54

128 million

Question 55

How many ganglion cells

Answer 55

1.5mill

Question 56

How many bipolar cells

Answer 56

35million

Question 57

How large is the macula

Answer 57

3.5DD

Question 58

Size and thickness of foveola

Answer 58

0. 35mm | 0. 13mm thick

Question 59

Size and thickness of fovea

Answer 59

1. 5mm diameter (1DD) | 0. 75mm thick

Question 60

What is the thickest part of the retina

Answer 60

Parafovea (0.5mm)

Question 61

How big is the perifovea

Answer 61

1.5mm

Question 62

Vertical diameter of the ON

Answer 62

1.75mm

Question 63

Horizontal diameter of the ON

Answer 63

1.5mm

Question 64

How long is the ON

Answer 64

50-60mm

Question 65

Intraocular portion of the ON

Answer 65

1mm

Question 66

Intraorbital portion of the ON

Answer 66

30mm

Question 67

Intracanalicular portion of the ON

Answer 67

6-10mm

Question 68

Intracranial portion of the ON

Answer 68

10-16mm

Question 69

What layers of the LGN do contralateral fibers go to

Answer 69

1,4,6

Question 70

What layers of the LGN do uncrossed fibers go to

Answer 70

2,3,5

Question 71

Where do superior fibers run

Answer 71

Medial

Question 72

Where do inferior fibers run

Answer 72

Laterally

Question 73

Eyelid layers

Answer 73

``` Skin SubQ areolar layer Orbicularis SubM areolar layer Orbital septum Post muscular system Tarsal plate ```

Question 74

Ciliary body layers

Answer 74

Supraciliaris Ciliary muscle Ciliary stroma Ciliary epithelium

Question 75

Choroid layers

Answer 75

Suprachoroid lamina Stroma Choriocapillaris Bruch’s membrane

Question 76

Layers of bruchs membrane

Answer 76

``` BM of choriocapilaris Outer collagenous zone Elastic layer Inner collagenous zone BM of RPE ```

Question 77

Layer of the sclera

Answer 77

- conjunctival epi (ACA) - conj stroma - tenons - episclera (ACA) - sclera - lamina fusca

Question 78

Retinal layers

Answer 78

``` RPE PR ELM ONL OPL INL IPL GCL NFL ILM ```

Question 79

Photoreceptors synapse with what in the OPL

Answer 79

Bipolar and horizontal cells

Question 80

What cell bodies are in the INL

Answer 80

horizontal bipolar Amacrine

Question 81

What synapses occur in the IPL

Answer 81

Bipolar to ganglion cells | Amacrine to both

Question 82

What are the inhibitory cells in the retina

Answer 82

Horizontal and amacrine

Question 83

RI of aqueous and vitreous

Answer 83

1.336