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Questions and Answers
What is the function of the iris in the eye?
What is the function of the iris in the eye?
What is the purpose of the ciliary muscle?
What is the purpose of the ciliary muscle?
What is the composition of the crystalline lens?
What is the composition of the crystalline lens?
What is the function of the parasympathetic nerve fibers in the eye?
What is the function of the parasympathetic nerve fibers in the eye?
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What is the purpose of the aqueous fluid produced by the ciliary body?
What is the purpose of the aqueous fluid produced by the ciliary body?
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What happens to the lens proteins with age?
What happens to the lens proteins with age?
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What regulates the strength of the lens?
What regulates the strength of the lens?
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What happens to the lens when the ciliary muscle contracts?
What happens to the lens when the ciliary muscle contracts?
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What determines the strength of the lens?
What determines the strength of the lens?
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What is the ability of the lens to change shape known as?
What is the ability of the lens to change shape known as?
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Study Notes
Anatomy of the Eye
- The choroid layer forms the ciliary body and iris in the front of the eye.
- The iris is the pigmented and colored part of the eye, with a round opening in the center called the pupil.
- The pupil is controlled by the autonomic nervous system, with parasympathetic nerve fibers causing pupillary constriction and sympathetic fibers causing pupillary dilation.
Iris Muscles
- The iris contains circular muscle that constricts and radial muscle that dilates the pupil.
- The iris muscles act like a camera diaphragm, regulating the amount of light that enters the eye.
Ciliary Body
- The ciliary body is located behind the iris and produces aqueous fluid that fills the front part of the eye.
- The ciliary body has two major components: the ciliary muscle and the capillary network that produces the aqueous humor.
Crystalline Lens
- The crystalline lens is a transparent structure made up of transparent cells that lose their nucleus and organelles during development.
- The lens is attached to the ciliary muscle by suspensory ligaments (ciliary zonule).
- As a person grows older, the lens grows larger and thicker, becoming less elastic due to progressive denaturation of the lens proteins.
Lens Accommodation
- The ciliary muscle regulates the strength of the lens through accommodation.
- The strength of the lens depends on its shape, which is regulated by the ciliary muscle.
- When the ciliary muscle is relaxed, the suspensory ligaments pull the lens, making it slightly flat.
- When the ciliary muscle contracts, the lens becomes more spherical (convex), increasing its strength.
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Description
Test your knowledge of the different parts of the human eye, including the cornea, retina, choroid, and more. Learn about the functions of each component and how they work together to enable vision.
