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Eye and CNS case discussion > Uvea > Flashcards

Uvea Flashcards

1
Q

What is the uvea?

A

Middle layer of the globe

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2
Q

What does the uvea consist of?

A

Iris
Ciliary body
Choroid

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3
Q

What forms the anterior uvea?

A

Iris and ciliary body

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4
Q

What forms the posterior uvea

A

Choroid

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5
Q

Is the uvea vascularise? is it pigmented?

A

Yes

Yes

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6
Q

What is the most rostral part of the uvea? Describe it

A

Iris
Forms ring around pupil
Sphincter that can dilate and constrict

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7
Q

What shape pupils do dogs and pigs have? What about cats?

A

Circular

Cats oval when dilated, vertical when constricted

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8
Q

Ungulates have pigmented masses on their pupillary margin of the iris. What are they called? What are they for?

A

Corpora nigra - pigemented extensions of the iris

Improve mitosis

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9
Q

The iris is separated into the 2 zones. What are these zones and what separates them?

A

Pupillary zone
Ciliary zone
Separated by the colarette

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10
Q

What does the pupillary zone of the iris contain?

A

Incomplete arterial circle

From posterior ciliary arteries

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11
Q

What innervates the constrictor muscle? What does this muscle do?

A 
Parasympathetic innervation (oculomotor CN III)
Determines pupil shape
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12
Q

What innervates the dilator muscle?

A

Sympathetic innervation

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13
Q

What is different about the dilator muscle in non-mammals?

A

Non-striated musce

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14
Q

What lines the posterior iris?

A

Pigmented epithelium

extended in ungulates to form corpora nigra

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15
Q

Where is the ciliary body located in relation to the iris?

A

Posterior

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16
Q

What does the ciliary body consist of? What does it form part of?

A

Ciliary process
Ciliary body muscles
Forms part of idiocorneal angle

17
Q

What is the function of the ciliary body?

A

Produces aqueous humour
Helps its drainage
Anchors the zonular fibres that suspend the lens

18
Q

The main portion of the ciliary body is what type of muscle in mammals? What about non-mammals?

A

Smooth muscle in mammals

Striated in non-mammals

19
Q

What 2 layers of epithelium cover the ciliary body?

A

Inner non-pigmented epithelium

Outer pigmented epithelium

20
Q

What is the function of the non-pigmented epithelium of the ciliary body?

A

Forms blood/aqueous barrier

Via tight junctions between cells

21
Q

What happens in diseases where there is alteration to the non-pigmented epithelium of the ciliary body?

A

Disrupts blood/aqueous barrier

Allows proteins and cells into the humour

22
Q

What are the 2 parts to the ciliary body?

A

Pars plicata

Pars plana

23
Q

What does the pars plicata have and why?

A

Ciliary processes - increase SA for aqueous production

24
Q

What is different about the pars plicata in reptiles/birds?

A

It’s attached to the lens

25
Q

What suspends the lens in mammals?

A

Zonular fibres from the ciliary process

26
Q

What is the idiocorneal angle?

A

Most anterior part of ciliary body

Where root of iris, anterior ciliary body and cornoscleral junction meet

27
Q

What is the function of the idiocorneal angle?

A

Main site of aqueous humour drainage

28
Q

Where is aqueous humour produced? How does it get to the idiocorneal angle to drain?

A

Posterior chamber

Through the pupil

29
Q

What ligaments does the idiocorneal angle contain?

A

Pectinate ligaments

30
Q

What is the choroid layer of the uvea between?

A

Sclera and retina

31
Q

Describe the choroid of the uvea

A

Highly vascular
Pigmented
Between sclera and retina

32
Q

What are the 4 layers of the choroid?

A

Suprachoroidae
Large vessel layer
Medium vessel layer
Choriocapillaris

33
Q

What is the tapetum lucid? What is its function? Where is it located?

A

Fibrous, light reflecting structure - allows to see in dark but with less acuity
Found within medium vessel layer of choroid

34
Q

Which layer of the choroid contains capillaries that supply the retina?

A

Choriocapillaris

35
Q

What is the function of the large vessel layer of the choroid?

A

Cool the eye

Heat via light

Eye and CNS case discussion (7 decks)

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