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Anatomy of the eye
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The eye is a sphere, and its wall is made of three layers stacked one on top of another. It is a camera with three linings: the case, the wiring and the film.
The outer one is called the fibrous tunic, and it is the case. In front it is the cornea, the transparent window that covers the iris, the colored part. Behind, it is the sclera, the white of the eye, which covers the whole globe except for that very window.
The middle one is called the vascular tunic, and vascular means full of blood vessels. It has three pieces: the choroid, the ciliary body and the iris. Its vessels are the ones that bring nourishment to the innermost layer.
And that innermost layer is the retina. It is the film of the camera, and it depends on the middle layer to feed it.
In brief
The wall of the eyeball has three layers: the fibrous tunic, the vascular tunic and the retina.
A camera with three linings: the case, the wiring and the film.
The fibrous tunic is the outer one: in front the cornea, which is transparent, and behind the sclera, the white of the eye, which covers almost all of the globe.
The vascular tunic is the choroid, the ciliary body and the iris, and its many vessels feed the retina.
Sources (1)
- National Center for Biotechnology Information, StatPearls PublishingAnatomy, Head and Neck, Eye, StatPearlsPublished
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