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13 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What happens to the anterior and posterior zonules when the ciliary body contracts during accommodation? |
Zonule fibers relax. Anterior zonules relaxes. Posterior zonule fibers stretch. |
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What is the function of the hyaloid vasculature? Why is it important to lens and eye development? |
Arterial supply from the optic stalk and optic disc. Usually regresses before birth. It provides nourishment for the developing lens in the growing fetus. |
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What are the three layers of the crystalline lens? |
Lens capsule Lens epithelium Lens fibres |
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Where is the lens epithelium located? |
The anterior surface of the lens. |
Epi : Most outer |
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What is the structure of the lens capsule? |
Thin, transparent, hyaline collagenous membrane which surrounds lens completely. |
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How is the lens capsule made? |
Secreted by the lens epithelium anteriorly and be elongating lens fibers posteriorly. |
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The lens capsule is thickest at the .... side. And thinnest at the .... pole. |
- Anterior side - Posterior pole |
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What is the main protein that makes up the lens capsule? |
Type IV collagen |
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What is the structure of the ciliary zonule? |
Series of fine, transparent and stiff fibres composed of glycoproteins. |
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Which two areas do the ciliary zonules originate from? |
Originates from the basal lamina of the non pigmented epithelium of pars plana and pars plicata of ciliary body |
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What is the overall function of the ciliary zonule? |
Holds the lens in position Enables the ciliary muscle to act on lens during accommodation. |
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What is the overall function of the ciliary zonule? |
Holds the lens in position Enables the ciliary muscle to act on lens during accommodation. |
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Which of the four types of zonule fibres are thick, wavy and near the vitreous? |
Orbiculo-anterior capsular fibres |
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