10 Questions
What is the approximate diameter of the adult eyeball?
2.5cm
What is the function of the sclera?
To provide attachment to the extra-ocular muscles
What is the transparent part of the eyeball that bends light rays?
Cornea
Where is the choroid located in the eyeball?
In the inner surface of the sclera
What is contained within the choroid?
Blood vessels
What are the three main parts of the eyeball?
The outer fibrous, the middle vascular, and the inner nervous layer
What is the function of the cornea in relation to light rays?
It bends light rays to focus them on the retina
What are the two structures that make up the outermost layer of the eyeball?
The sclera and cornea
In which part of the eyeball can the lens, aqueous fluid, and vitreous body be found?
Inside the eyeball
What is the purpose of the iris, ciliary body, and choroid in the eyeball?
They are part of the middle vascular layer
Study Notes
The Eyeball Structure
- The adult eyeball measures approximately 2.5cm in diameter.
- The eyeball is divided into three main parts: outer fibrous, middle vascular, and inner nervous layers.
Outer Fibrous Layer
- Comprises the sclera and cornea.
- The sclera is the white, outer coat of the eyeball, covering the posterior and lateral aspects.
- The cornea is a transparent, convex structure that bends light rays to focus them on the retina.
- The sclera maintains the shape of the eye and provides attachment to the extra-ocular muscles.
Middle Vascular Layer
- Consists of the choroid, ciliary body, and iris.
- The choroid lies posteriorly on the inner surface of the sclera.
- The choroid contains blood vessels.
Inner Nervous Layer
- Comprises the retina.
Other Structures Inside the Eyeball
- The lens is a structure inside the eyeball.
- The aqueous fluid and vitreous body are also found within the eyeball.
The Eyeball Structure
- The adult eyeball measures approximately 2.5cm in diameter.
- The eyeball is divided into three main parts: outer fibrous, middle vascular, and inner nervous layers.
Outer Fibrous Layer
- Comprises the sclera and cornea.
- The sclera is the white, outer coat of the eyeball, covering the posterior and lateral aspects.
- The cornea is a transparent, convex structure that bends light rays to focus them on the retina.
- The sclera maintains the shape of the eye and provides attachment to the extra-ocular muscles.
Middle Vascular Layer
- Consists of the choroid, ciliary body, and iris.
- The choroid lies posteriorly on the inner surface of the sclera.
- The choroid contains blood vessels.
Inner Nervous Layer
- Comprises the retina.
Other Structures Inside the Eyeball
- The lens is a structure inside the eyeball.
- The aqueous fluid and vitreous body are also found within the eyeball.
Explore the structure and components of the adult eyeball, including the outer fibrous, middle vascular, and inner nervous layers, and their functions.
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