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Optical Anatomy > Iris > Flashcards

Iris Flashcards

1
Q

what separates the lens from the iris

A

a thin layer of aqueous

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2
Q

where is the pupil

A

the central (black) part of the iris

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3
Q

what happens to the iris when you go outside

A

it constricts

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4
Q

What is the purpose of the pupil

A

to control the amount of light entering the eye

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5
Q

Is the iris constantly moving

A

yes

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6
Q

What is the range of pupil diameter of the iris

A

1-9mm

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7
Q

What is miosis

A

when the iris constricts

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8
Q

what is mydriasis

A

when the iris dialates

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9
Q

Do iris’s change throughout species

A

yes

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10
Q

What is the shape of the iris

A

teardrop shaped, two leaflets

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11
Q

what is the attachment of the iris to the cilliary body

A

iris root

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12
Q

where is the thinnest part of the iris

A

iris root

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13
Q

what is iridodialysis

A

when the iris root separates from the ciliary body

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14
Q

where is the inner pupillary zone?

A

from the pupil to 1mm and 1/2 inward

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15
Q

where is the peripheral/ ciliary zone?

A

from the iris root to the inner pupillary zone

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16
Q

what separates the ciliary zone from the inner pupillary zone?

A

iris collarette

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17
Q

why is there a division between these zones

A

muscluary changes

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18
Q

where is the iris located

A

anterior to the lens

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19
Q

what is the fetal pupillary membrane

A

the beginning of the vascular system for the iris

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20
Q

where does the iris tissue form?

A

around the fetal pupillary membrane

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21
Q

what is the iris tissue made of?

A

the leading edge of the optic cup

22
Q

where is the location of the pupillary membrane in adults

A

the collarette

23
Q

why does the leading edge of the optic cup for the iris?

A

because the fetal pupillary membrane calls it forward

24
Q

What does poor formation of the pupillary membrane of the iris cause

A

persistant pupillary membrane

25
Q

what surround the iris leaflet

A

aqueous

26
Q

what is the most anterior part of the iris

A

anterior border layer

27
Q

what is right against the anterior layer of the iris

A

a monolayer of fibroblasts

28
Q

what connects the fibroblasts in the anterior border to each other

A

gap junctions and tight junctions

29
Q

what is the point of the tight junction of the fibroblasts in the anterior border of the iris

A

for structure

30
Q

what is directly posterior to the fibroblasts of the anterior border layer

A

melanocytes

31
Q

what type of collagen in the anterior border layer of the iris

A

collagen type one

32
Q

what is in the stroma posterior to the anterior border layer

A

collagen type one

33
Q

where is the anterior border layer?

A

pupil margin to the iris root

34
Q

What are the crypts of Fuch

A

depression that are located on both side of the collarette in the anterior border layer

35
Q

what is the uveal tract

A

the iris, ciliary body and choroid

36
Q

what is trabeculae

A

the orientation of the collagen in the anterior boarder layer

37
Q

what are you looking at when you look through the cryps of Fuch

A

stroma

38
Q

what is the main type of collagen in the iris stroma?

A

collagen type one

39
Q

In the iris stroma what is the white area

A

aqueous humor fluid

40
Q

why are the tight junctions in the anterior border layer

A

to provide structure, not to act as a border

41
Q

Is everyone’s iris the same?

A

no

42
Q

What type of cells are in the iris stroma

A

melanocytes, fibroblasts, melanophages (clump cells), WBCs (APCs)

43
Q

why are the blood vessels in the iris formed in a wavy pattern?

A

to allow for movement

44
Q

What are the blood vessels of the iris wrapped in, what keeps these in place

A

the vessels are wrapped in a collagen sheath. these are kept in place with collagen trabeculae in the stroma

45
Q

what is the minor circle of the iris

A

spaces where the iris doesn’t have blood vessels present

46
Q

what being the pupillary membrane

A

blood vessels

47
Q

where is the fetal pupillary membrane

A

anterior to the lens

48
Q

what does the fetal pupillary membrane turn into?

A

minor circle of iris

49
Q

What is the major circle of the iris?

A

a complete anastomosing circle of blood vessels

50
Q

where is the major circle of the iris

A

in the cillary body near the iris root

Optical Anatomy (2 decks)

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