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3. The fibrous tunic (sclera and cornea) provides
mechanical support and some degree of
physical protection and serves as an attachment
site for the extrinsic eye muscles.
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8. The vascular tunic which includes the choroid,
iris, ciliary body, provides a route for blood
vessels and lymphatics, regulates amount of
light entering the eye, secretes and reabsorbs
aqueous humor, and controls the shape of the lens.
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12. The visual receptors, or photoreceptors, are
located in the neural tunic (retina).
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