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BOARDS > Ocular Anatomy Numbers > Flashcards

Ocular Anatomy Numbers Flashcards

1
Q

How far from the limbus does the medial rectus insert

A

5.5mm

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2
Q

How far from the limbus does the IR insert

A

6.5mm

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3
Q

How far from the limbus does the LR insert

A

6.9mm

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4
Q

How far from the limbus does the SR insert

A

7.7mm

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5
Q

Where is the sclera the thinnest and how thin is it

A

Rectus insertions sites

0.3mm

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6
Q

Where is the scleral the thickest and how thick

A

Posterior pole

1mm

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7
Q

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

A

Anterior

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8
Q

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

A

Posterior

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9
Q

Where are the obliques pure elevators/depressors

A

51-55 degrees to the nose

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10
Q

Where are the SR/IR pure elevator/depressor

A

23 degrees to the ear

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11
Q

What nerves run through the cavernous sinus

A

3,4,6,V1,VII

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12
Q

Normal axial length

A

24mm

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13
Q

Horizontal diameter of the eye

A

23.5mm

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14
Q

Vertical diameter of the eye

A

23mm

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15
Q

Lens anterior radius of curvature

A

8-14um (flat)

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16
Q

Lens posterior ROC

A

5-8um (steep)

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17
Q

PH of the lens

A

6.9

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18
Q

Refractive index of the lens

A

1.41 in the center

1,38 at the surfaces

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19
Q

Thickness of peripheral cornea

A

0.67mm

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20
Q

CCT

A

0.55mm

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21
Q

Posterior ROC or cornea

A

7.8 (flat)

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22
Q

Posterior ROC of cornea

A

6.5 (steep)

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23
Q

Horizontal diameter of the anterior cornea

A

11.7

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24
Q

Vertical diameter of the anterior cornea

A

10.6

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25
Q

Horizontal diameter of the posterior cornea

A

11.7

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26
Q

Vertical diameter of the posterior cornea

A

11.7

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27
Q

Layers of the cornea

A 
Epithelium
Bowmans
Stroma
Descemets
Endothelium
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28
Q

Corneal epithelium thickness

A

50um

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29
Q

Bowmans thickness

A

15um

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30
Q

Corneal stroma thickness

A

450um

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31
Q

Descemets thickness

A

5-15um

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32
Q

Corneal endothelium thickness

A

5um

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33
Q

ROC of sclera

A

11.5mm

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34
Q

Where is the sclera the weakest

A

Lamina cribrosa

35
Q

Normal pupil size

A

3-4mm

36
Q

Width of iris

A

12mm

37
Q

Thickness of the choroid at posterior pole

A

0.2mm

38
Q

Thickness of choroid at ora

A

0.1mm

39
Q

Thickness of bruchs

A

2um

40
Q

Volume of vitreous chamber

A

80% of globe, 4uL

41
Q

Water content of vitreous

A

98.5-99.7%

42
Q

Type I collagen

A

Bones
Bowmans
Stroma
Sclera

43
Q

Type II collagen

A

Vitreous

44
Q

Type IV collagen

A

Descemets and BM

45
Q

Blood aqueous barrier

A

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

46
Q

Blood retinal barrier

A 
RPE cells (between)
Around retinal BV
47
Q

Where is the rod ring in the retina

A

5mm from the fovea

48
Q

How large is the fovea

A

1DD (1.5mm)

-5mm temporal, 0.4mm inferior to disc

49
Q

What wavelength for cyanolabe

A

440nm

50
Q

Wavelength for chlorolabe

A

535nm

51
Q

Wavelength for erythrolabe

A

565nm

52
Q

Layers of the LGN for parvo cells

A

3,4,5,6

53
Q

Layers of the LGN for magno cells

A

1, 2

54
Q

How many photoreceptors

A

128 million

55
Q

How many ganglion cells

A

1.5mill

56
Q

How many bipolar cells

A

35million

57
Q

How large is the macula

A

3.5DD

58
Q

Size and thickness of foveola

A
  1. 35mm

0. 13mm thick

59
Q

Size and thickness of fovea

A
  1. 5mm diameter (1DD)

0. 75mm thick

60
Q

What is the thickest part of the retina

A

Parafovea (0.5mm)

61
Q

How big is the perifovea

A

1.5mm

62
Q

Vertical diameter of the ON

A

1.75mm

63
Q

Horizontal diameter of the ON

A

1.5mm

64
Q

How long is the ON

A

50-60mm

65
Q

Intraocular portion of the ON

A

1mm

66
Q

Intraorbital portion of the ON

A

30mm

67
Q

Intracanalicular portion of the ON

A

6-10mm

68
Q

Intracranial portion of the ON

A

10-16mm

69
Q

What layers of the LGN do contralateral fibers go to

A

1,4,6

70
Q

What layers of the LGN do uncrossed fibers go to

A

2,3,5

71
Q

Where do superior fibers run

A

Medial

72
Q

Where do inferior fibers run

A

Laterally

73
Q

Eyelid layers

A 
Skin
SubQ areolar layer 
Orbicularis 
SubM areolar layer 
Orbital septum 
Post muscular system 
Tarsal plate
74
Q

Ciliary body layers

A

Supraciliaris
Ciliary muscle
Ciliary stroma
Ciliary epithelium

75
Q

Choroid layers

A

Suprachoroid lamina
Stroma
Choriocapillaris
Bruch’s membrane

76
Q

Layers of bruchs membrane

A 
BM of choriocapilaris 
Outer collagenous zone 
Elastic layer 
Inner collagenous zone 
BM of RPE
77
Q

Layer of the sclera

A
  • conjunctival epi (ACA)
  • conj stroma
  • tenons
  • episclera (ACA)
  • sclera
  • lamina fusca
78
Q

Retinal layers

A 
RPE
PR
ELM
ONL
OPL
INL
IPL
GCL
NFL
ILM
79
Q

Photoreceptors synapse with what in the OPL

A

Bipolar and horizontal cells

80
Q

What cell bodies are in the INL

A

horizontal
bipolar
Amacrine

81
Q

What synapses occur in the IPL

A

Bipolar to ganglion cells

Amacrine to both

82
Q

What are the inhibitory cells in the retina

A

Horizontal and amacrine

83
Q

RI of aqueous and vitreous

A

1.336

BOARDS (14 decks)

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