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Ocular anatomy > Uvea choroid and ciliary body > Flashcards

Uvea choroid and ciliary body Flashcards

1
Q

What is the function of ciliary body

A

Mexhansim of accommodation

Maintenance of lens zonules

Source of aqueous humour

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2
Q

What is teh general arragnment of the ciliary body

A

Annular structure that extends anteriorly from scleral spur (anterior border) to ora serrata (posterior border that transits to choroid)

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3
Q

What are the two parts the ciliary body can be divided into

A

Pars plicata (front)
Pars plana (back)

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4
Q

What structure does the pars plicata contain

A

Ciliary processes

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5
Q

Where does zonular fibres attach to the lens capsulefrom

A

Zonular fibres arise from pars plana, pass in between the processes and attach to the lens capsule

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6
Q

What is the transition between the ciliary body and retina and how does it take place

A

Smoother posterior surface at the pars plana merges with the retina at ora setrata

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7
Q

What is the viterous base

A

Where the viterous attaches to the posterior pars plana

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8
Q

What are the three layers of the ciliary body from sclera to ciliary body

A

Supracililaris
Stroma
Epithelium

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9
Q

What happens at the supraciliaris

A

Zone of transition from the ciliary stroma to the stroma

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10
Q

What structure does the supraciliaris consist of

A

Collagen, fibroblasts and melanocytes

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11
Q

What are the structures in the stroma (ciliary muscle)

A

Ciliary muscle, consits of 3 type of smooth muscle: lontiduinal, radial and circular fibres

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12
Q

Description of epithelium (ciliary muscle)

A

double layer that extends from iris root to the retina

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13
Q

What are the two layers of the epithelium (ciliary muscle)

A

Pigmented layer

Non-pigmented layer
(closer to sclera)

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14
Q

What structures is the pigmented layer in continuation with

A

Anteriorly continous with the iris epithelium

Posteriorly continous with the anterior continuation of the retinal pigment epithelium

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15
Q

What structures is the non pigmented layer in continuation with

A

Inner layer of cells that is continous with the nerouvs part of the retina

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16
Q

What role does the non-pigmneted layer (IMPT)

A

Aqeuous production, where is modifies metabolites, they then diffuse from the capillaries of the ciliary processes and secret the product as aqueous humour into the poseterior chamber

17
Q

What is the function of the blood aqeuous barrier

A

seperates the interior portion of the eye from blood entering the eye for maintenenace of transparency

18
Q

What is the blood aqeuous barrier formed by

A

non fenestrated iris vessels

19
Q

What could eye inflammation, intraocular surgery or trauma result in for the blood aqueous barrier

A

damage to the barrier. which results in the leakage of plasma proteins into anterior and posterior chambers, affecting transparency

20
Q

What is the blood supply to the ciliary muscle

A

It contains the major arterial circle (near its attachment to the root of the iris) :
- 2 long posterior and 4-6 anterior ciliary ateries

The extensive capiliary bed in ciliary processes and vessels of ciliary muscles

21
Q

What is the venous drainage in the ciliary body

A

Vortex veins

22
Q

What is the nerve supply to ciliary muscles

A

Postganglionic parasympathetic fibres, via short ciliary nerves

Sympathetic fibres for vasoconstriction distrbuted to muscle and blood vessels

23
Q

Where does the choroid attend from and to

A

Anteriorly from ora serrata to edge of optic disc

24
Q

Description of choroid

A

A vascular pigmented layer between sclera and retina

25
Q

What are the four layer of the choroid

A

Suprachoroid
Stroma
Choriocapillaris
Bruch’s membrane

(furthest from retina to closest)

26
Q

State the function of the choroid

A

Suprachoroidal space provides a route for blood vessels to the anterior uvea

High blood flow thorugh choroidal vessels regulate eye temperature

Supplies metabolites and removes waste products from the outer layers of the retina

Choroidal pigments absorb light that passed thr retina to prevent internal reflection

Bruch’s membrane provides basement membrane for retinal pigment epithelium

27
Q

What arteries and nerves does the suprachoroidal space contain

A

long posterior ciliary arteries and nerves

28
Q

What does suprachoroidal space consist of

A

collagen fibres that are continous from sclera, melanocytes and fibroblast

29
Q

What does the stroma (choroid) consist of

A

Pigmented layer consists of loose connective tissue and b.v, containing melanocytes, fibroblasts, collagen, macrophages and lymphocytes

30
Q

What are the two layers that the blood vessels in the stroma of the choroid are divided into

A

Haller’s layer, external layer of large diameter blood vessles

Sattler’s layer, internal layer of smaller diamete blood vessels (SS)

31
Q

Give a description of choriocapillaris

A

Single layer of fenestrated capillaires, fed by arteries in the stroma and drained by veins also in the stroma

32
Q

What are does the choriocapillaries consist of

A

Between the capillaries there are fine collagen fibres, fibroblasts and unmyelinated nerve fibers

33
Q

What are the five layers of the Bruch’s membrane

A

Basement layer of the choriocapillaris

Outer collagenous zone

Elastic layer

Inner collagenous zone

Basement membrane of retinal pigment epitherlial cells

34
Q

What is the blood supply of the choroid

A

Circle of Haller-Zinn, formed by anastomosis of short posterior ciliary artery and via recurrent arteries from the major arteiral circle

(are branches of ophthalmic artery)

35
Q

What is the blood drainage of the choroid

A

vorticose/ vortex vein, that drains int o superior and inferior opthalmic vein

36
Q

What is the nerve supply of the choroid

A

Short posterior ciliary nerve (carries parasympathetic and sympathetic nerves)

Sympathetic nerve causes marked vasoconstriction which reduces choroidal blood flow

Ocular anatomy (15 decks)

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