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CLO > Uveal Tract > Flashcards

Uveal Tract Flashcards

1
Q

Iris: Location

A

Separates anterior and posterior chambers

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2
Q

Iris: Function

A

Varies aperture of pupil to control the amount of light focusing on the retina

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3
Q

Diameter: Iris

A

~13mm

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4
Q

Thickness: Iris

A

0.1mm at root

0.6mm at collarette

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5
Q

Diameter: Pupil

A

1-8mm (varies in different lighting)

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6
Q

Blood Supply: Iris

A

Major arterial circle in ciliary body - ends with capillary loops at pupil margin

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7
Q

Blood Drainage: Iris

A

Ciliary plexus

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8
Q

Nerve Supply: Iris

A

Long and short ciliary nerves from nasociliary branch of ophthalmic division of trigeminal nerve

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9
Q

Layers: Iris (3)

A

Anterior Border Layer

Stroma

Epithelium

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10
Q

Anterior Border Layer (iris) (3)

A

More melanocytes = velvety brown texture

Less pigment in Cryts of Fuch

Fibroblasts and meloncytes

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11
Q

Stroma (iris) (3)

A

Collagen connective tissue

Blood vessels

Iris sphincter muscle

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12
Q

Muscle type: Iris Sphincter Muscle

A

Smooth

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13
Q

Epithelium (iris) (3)

A

Pupil ruff

Dilator pupillae muscle

Densely packed melanin

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14
Q

Purpose of melanin in epithelium (iris)

A

Absorbes light

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15
Q

Choroid: Location

A

Sandwiched between outer sclera and inner retina from ora serrata to edge of optic nerve

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16
Q

Choroid: Function (4)

A

Allows for metabolic exchange

Waste removal to and from photoreceptors

Regulates temperature of globe

Deep pigment layer to absorbe light

17
Q

Choroid: Blood Supply (2)

A

Major arterial circle

Circle of Haller-Zinn

18
Q

Layers: Choroid (4)

A

Suprachoroid

Stroma

Choriocapillaris

Basal Lamina

19
Q

Suprachoroid (4)

A

Outer layer

30um thick with structural link of collagen fibrils with sclera

Contains meloncytes and fibroblasts

Route for nerves and blood vessels

20
Q

Stroma (choroid) (2)

A

Pigment layer

Highly vascular

21
Q

Choriocapillaris (3)

A

Single layer of wide capillaries

Lies flat against base layer

Thickness and internal blood pressure to counter act intraocular pressure

22
Q

Basal Lamina (4)

A

2-4um thick

Smooth layer for retinal pigment layer

Contains collagen and elastin

Drusen can form here

23
Q

Location: Ciliary body

A

Runs radially from scleral spur to ora serrata

24
Q

Function: Ciliary Body (2)

A

Involved in accommodation as it contains ciliary muscle and anchors lenticular suspensory fibres

Involved in production of aqueous and vitreous

25
Q

Blood Supply: Ciliary Body

A

Major arterial circle

Arteries

26
Q

Layers: Ciliary Body (3)

A

Supraciliaris

Stroma

Epithelium

27
Q

Supraciliaris (2)

A

Transitions from stroma to sclera

Collagen strands with fibroblasts and meloncytes

28
Q

Stroma (Ciliary Body) (4)

A

Mostly filled with ciliary muscle

Muscles contract to reduce tension on sensory fibres causing accommodation

Thick walled blood vessels for muscle metabolism

Fenestrated capillaries for supply of constituents for aqueous production

29
Q

Muscle type of the longitudinal, radial and circular muscles in the ciliary body

A

Smooth

30
Q

Epithelium (Ciliary Body) (4)

A

Double layer cuboidal cells from iris root to retina

Pigmented cells in outer ring of ciliary body

Unpigmented and pigmented in inner ring

Suspensory zonules of crystalline lens extends from basement membrane in outer ring to inner ring

31
Q

Role of unpigmented cells in the ciliary body epithelium

A

Modify metabolites from capillaries to secrete aqueous into posterior chamber

32
Q

What does the cells of ciliary processes contain

A

Glycogen

33
Q

4 types of Aqueous Flow

A

Diffusion

Dialysis

Ultrafiltration

Secretion

34
Q

Diffusion

A

Oxygen, carbon dioxide, amino acids, glucose and vitamins travel through cell membrane by diffusion

35
Q

Dialysis

A

Permeable capillaries allow through smaller particles and restrict larger

Causes unequal gradient forcing smaller particles to move across to achieve balance

36
Q

Ultafiltration

A

Pressure pushes fluid fluid through wall but restricts larger proteins causing imbalance

Produces reverse osmotic effects forcing fluid back into blood vessels

CLO (13 decks)

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