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Cards In This Set
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Where does the choroid extend from?
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From the ora serrata to the Optic nerve
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What ocular tissue layers is the choroid between?
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The sclera and the RPE
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Where is the choroid thickest and what is its thickness?
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In the posterior pole (.2mm)
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Where is the Choroid thickest and what is its thickness?
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In the posterior pole (.2mm)
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Where is the choroid thinnest and what is its thickness?
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Thinnest at the ora serrata where it is .1mm
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What are the 4 layers of the choroid?
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2 central vascularized layers surrounded by nonvascularized membranes.
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What are the 4 layers of the choroid? (from the most posterior/closest to the sclera inward)
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1. Suprachoroid2. Choroidal stroma3. Choriocapillaris4. Bruch's membrane
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Suprachoroid lamina:
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Most posterior layer of the choroid. It lies adjacent to the lamina fusca of the sclera and is continuous with the supraciliaris of the ciliary body. The suprachoroidal space (above this layer) allows for the long posterior ciliary arteries and long posterior ciliary nerves to course up to the front of the eye.
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Choroidal stroma:
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A loose connective tissue layer that contains chroidal blood vessels and nerves and dense melanin granules. The short posterior ciliary artery vessels form two separate layers in the stroma: These are1. HaLLers layer: LARGE vessels ,more posteriorly, that branch and form sattler's layer2. Sattler's layer: SMALLER vessels that ultimately form a capillary bed. The veins that leave this bed are the large vortex veins, and are unusual in that they contain no valves.
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What are the choroidal vessels innervated by?
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The sympathetic nervous system, which causes vasoconstriction
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What about the choroid make it a potential site for melanoma formation?
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High melanin and vascularization.
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What is the most common primary intraocular tumor in adults?
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Choroidal melanoma
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What is the choriocapillaris?
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A huge capillary bed with fenestrated capillaries, whose function is to nourish the outer retinal layers; most concentrated in the macula area. Diabetes mellitus can damage blood vessels in this area, slowing the diffusion of oxygen and nutrients to the macula.
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Where/what is Bruch's membrane (basal lamina) of the choroid?
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The innermost layer of the choroid. It runs from the optic nerve to the ciliary body. It represents fusion of the choriocapillaris and the RPE basement membranes. It contains 5 layers: Basement membrane of the choriocapillaris, outer collagenous layer, elastic layer, inner collagenous layer, BM of RPE.
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What is Pseudoxanthoma Elasticum?
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A rare, inherited disorder that damages connective tissue throughout the body. If the elastic layer of Bruch's membrane is damaged (angiod streaks) a CNV membrane can result leading to a serous and or hemorrhagic retinal detachment.
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