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extrinsic eye muscles
skeletal muscles that attach to the outside of the eyeball and bones of the orbit
regulates size of pupil; colored part of the eye that consists of smooth muscle fibers that form a doughnut-shaped structure; attaches to the ciliary body
outer layer; the transparent anterior portion that lies over the iris; no blood vessels found
middle layer; pigmented membrane lining more than two thirds of the posterior fibrous outer coat
attached to the ciliary processes and blends with the elastic capsule of the lens to hold it in place
contains vitreous humor; small space posterior to the iris and anterior to the lens
optic disk (blind spot)
small circular area in the posterior part of the eyeball; light rays striking this area cannot be seen
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