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Eye and CNS case discussion > Aqueous and vitreous humour > Flashcards

Aqueous and vitreous humour Flashcards

1
Q

What is aqueous humor? Where is it located? Is it more or less dense than water?

A

Ultrafiltrate of plasma
Anterior eye
More dense

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2
Q

Where is aqueous humor produced?

A

Ciliary body

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3
Q

Where is aqueous humor drained?

A

Idiocorneal angle (anterior ciliary body, iris and cornoscleral junction)

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4
Q

What is the function of the aqueous humour?

A

Provide nutrition to lens and cornea

Maintain intraocular perssure

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5
Q

Constant production and drainage of aqueous humor is required to maintain intraocular pressure. What is the IOP in a dog?

A

15-25mmHg

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6
Q

What is the function of maintaining IOP?

A

Maintains position of eye
Health of structures
Rigidity of globe

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7
Q

What is glaucoma?

A

Production of aqueous humour exceeds drainage

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8
Q

What are the 3 processes that produce aqueous humour?

A

Diffusion
Ultrafiltration
Active secretion

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9
Q

What causes each phase of aqueous humor production?

A

Diffusion due to different solutes
Ultrafiltration due to different HSP of IOP and ciliary body capillaries
Active secretion due to active transport of sodium by ciliary epithelium

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10
Q

What is the most important factor for active secretion of aqueous humor?

A

Osmolarity between HSP and plasma

Should be similar

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11
Q

What can be used to treat glaucoma and why?

A

Bicarbonate

Affects sodium movement - active transport of sodium required for active secretion of aqueous humor

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12
Q

What causes aqueous humor to circulate? What is this type of circulation called?

A

Temperature differences

Thermal circulation

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13
Q

What is uveoscleral outflow?

A

Unconventional pathway of aqueous flow

Bypass aqueous plexus

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14
Q

Which species may have uveoscleral outflow?

A

Often horses

Sometimes in cats/dogs

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15
Q

What is vitreous humor? Where is it found?

A

Gel like substance in posterior eye (between lens and retina)

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16
Q

Vitreous humor is mainly water. What is it created by and how?

A

Fibrinous proteins

Trap hyaluronic acid

17
Q

What is the function of vitreous humour?

A

Transmits late
Supports globe
Stores waste and nutrients for retina

18
Q

What are the 2 zones of vitreous humor?

A

Outer cortical zone

Inner central zone

19
Q

What is the hyaloid canal?

A

Canal running through inner central zone of vitreous body

Where hyaloid artery was during foetal development

20
Q

What is the remnant of the hyaloid canal called?

A

Mittendorf’s dot

21
Q

Is vitreous humor static?

A

No - fluids and solutes move through

22
Q

What is found after the anterior face of the vitreous body?

A

Lens

Eye and CNS case discussion (7 decks)

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