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Unit 1-Lecture 2.pptx - Unit 1-The Eye Lecture 2-Structure...

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Unit 1-The Eye Lecture 2-Structure of the Eye
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Structure of the Eyeball A slightly irregular hollow sphere with anterior and posterior poles The wall is composed of three tunics – fibrous, vascular, and sensory The internal cavity is filled with fluids called humors The lens separates the internal cavity into anterior and posterior segments
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Structure of the Eyeball Figure 15.4a
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Fibrous Tunic Forms the outermost coat of the eye and is composed of: Opaque sclera (posteriorly) Clear cornea (anteriorly) The sclera protects the eye and anchors extrinsic muscles The cornea lets light enter the eye
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Vascular Tunic (Uvea): Choroid Region Has three regions: choroid, ciliary body, and iris Choroid region A dark brown membrane that forms the posterior portion of the uvea Supplies blood to all eye tunics
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Vascular Tunic: Ciliary Body A thickened ring of tissue surrounding the lens Composed of smooth muscle bundles (ciliary muscles) Anchors the suspensory ligament that holds the lens in place
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