Week 10 Flashcards

1
Q

what is the function of the crystalline lens

A

transparency/refraction
accommodation

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2
Q

what is the shape of the lens

A

biconvex - anterior less convex
between iris and vitreous

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3
Q

what is the lens supported by

A

suspensory ligaments from ciliary processes

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4
Q

What is the capsule

A

transparent and highly elastic basement membrane

moulds lens into shape during accommodation

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5
Q

what is the lens epithelium

A

Single layer of cuboidal epithelial cells, under the anterior capsule

Become more columnar towards the equator

Produces lens fibres; transports nutrients from aqueous humour to lens interior

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6
Q

what are the lens fibres

A

each fibre is a long hexagonal prism
New fibres are laid over the older ones
Fibre nuclei form a lens bow
Newer cells form the cortex

As the lens grows and fibres become more packed

the lens becomes sclerotic, with a progressive loss of accommodation with age

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7
Q

what is in the pars plicata

A

ciliary body

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8
Q

what are the zonular fibres

A

suspensory ligaments

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9
Q

what is a cortical cataract

A

opacification in discrete pathces within the cortex

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10
Q

what are the functions of vitreous humour

A

supports the prosterior surface of the lens and lines retina

transmits light

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11
Q

what is the composition of the vitreous humour

A

collogen filaments
hyaluronic acid

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12
Q

what is the choroid

A

provides blood
pigmented absorb stray light
heat exhange from the retina

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13
Q

suprachoroid

A

Transition between the choroid and sclera

Consists of collagen fibres, melanocytes and fibroblasts

Allows a passage for nerves and blood vessels to anterior uvea

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14
Q

what is the two layers of the stroma of the choroid

A

haller’s layer - large vessels/near sclera
sattler’s layer - smaller vessels/near retina

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15
Q

what is choriocapillaris

A

Single layer of wide-bore capillaries

Packed tightly in a single plane against the basal lamina

Nourish the outer part of the retina

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16
Q
A
17
Q

what is the blood supply for the choroid

A

circle of Haller zinn
vortex veins