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Module 7 Uveal Tract And Lens > Uveal Tract > Flashcards

Uveal Tract Flashcards

1
Q

The uveal tract is divided in to the anterior and posterior portions. What makes up those portions?

A

Anterior- iris and ciliary body

Posterior- choroid

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2
Q

In embryology what is the pupillary membrane formed from?

A

Mesenchyme

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3
Q

In embryology what is the iris formed from?

A

Neuroectoderm

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4
Q

What does the choroid sit between?

A

The retina and the sclera

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5
Q

What is Aniridia?

What is this often part of?

A

Absence of iris tissue

Multiple ocular defect

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6
Q

What is the purpose of pupillary membranes during development?

A

Surround and Nourish the lens

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7
Q

Persistent pupillary membranes v synechiae arise from which?

  • pupil margin/ periphery
  • iris collarette
A

Synechiae - pupil margin/ periphery

PPMs - iris collarette

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8
Q

What breeds get uveodermatological syndrome?

How do you diagnose?

What is the treatment?

A

Akitas/ artic breeds

Skin biopsies

Immunosuppressives- topical steroids, systemic ciclosporin/ preds/ azothioprine

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9
Q

What is phacoclastic uveitis caused by?

Does this cause fast or slow release of lens proteins?

A

Direct lens trauma

Fast

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10
Q

What is phacolytic uveitis caused by?

Does this cause fast or slow release of lens proteins?

A

Cataracts

Slow

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11
Q

What virus/ vaccine can cause a type IV hypersensitivity reaction causing corneal oedema?

A

Canine adenovirus

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12
Q

How do you test for toxoplasmosis in cats?

A

Rising titre of IgG and IgM over 3-4weeks

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13
Q

What is the most common secondary neoplasia affecting the eye?

A

Lymphoma

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14
Q

The iris sphincter muscle is by which innervation?
Sympathetic or parasympathetic?
The iris dilator muscle?

A

Iris sphincter muscle - parasympathetic

Iris dilator muscle - sympathetic

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15
Q

Which surface is the epithelium on? The anterior or posterior?

A

Posterior

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16
Q

What is the colour of the iris if there are no melanocytes (albino)?

A

Pink

17
Q

Which part secretes aqueous humour?

A

Non pigmented epithelium

18
Q

Which bit of the ciliary body includes the ciliary processes?

A

Pars plicata- anterior portion, includes ciliary processes holding the lens
Pars plana- posterior portion

19
Q

What is present in the Iris?

What does this mean?

A

Rubeosus irides

Acute uveitis

20
Q

What do these follicles indicate?

A

Chronic uveitis

21
Q

What causes reflex uveitis?

A

Corneal insult via CN V

22
Q

Where do uveal cysts come from?

A

Posterior pigmented layer of the iris

23
Q

If this is seen in a Burmese then disappears the next day, what is this likely to be?

Cause?

A

Lipid laden aqueous

Hyperlipidaemia

24
Q

What cells does uveodermatological syndrome attack?

A

Melanocytes

Module 7 Uveal Tract And Lens (2 decks)

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