Term
What are the two systems of blood vessels in the eye? |
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Definition
| ciliary circulation and retinal circulation |
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Term
| how many short posterior ciliary arteries are there? |
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Definition
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Term
| how do the short posterior ciliary arteries enter the eye? |
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Definition
pierce the sclera around the optic disc. -form fine episcleral plexus -form Circle of Zinn |
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Term
| as the short posterior ciliary arteries terminate, what are they called? |
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Definition
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Term
| how many layers do the choriocapillaris form? |
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Definition
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Term
| what do the choriocapillaris supply? |
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Definition
| photoreceptors, RPE, choroid |
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Term
| what happens to the branching and size of short posterior ciliary arteries as they deeper? |
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Definition
They branch more and get smaller Haller's (huge, least branched) Sattler's (small) choriocapillaris (smallest, most branched) |
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Term
| how man long posterior ciliary arteries are there? |
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Definition
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Term
| trace the path of the long posterior ciliary arteries. |
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Definition
| pierce sclera at posterior --> travels initally in sclera, then epichoroid --> at ora serrata branch into inf. and sup. divisions --> inf. and sup. divisions anastomose --> forms major arterial circle of iris |
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Term
| what muscle do the anterior ciliary arteries pass through? |
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Definition
rectus muscles -2 from each rectus except lateral which carries 1 |
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Term
| trace the path of the anterior ciliary arteries. |
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Definition
| pass through rectus muscles --> pierce eye close to limbus --> runs initially in episclera --> forms episcleral plexus --> becomes intrascleral plexus as goes deeper --> joins MAC --> supplies anterior of eyeball |
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Term
| What are the main divisions of the central retinal artery? |
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Definition
superior papillary artery inferior papillary artery |
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Term
| In what layers can you find retinal venules and arterioles? |
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Definition
NFL capillary beds go no further than INL |
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Term
| what area of the retina has the most capillary networks? |
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Definition
| the macula region - it has 3 |
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Term
| what are the two veins of the eye? |
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Definition
central retinal vein - retinal cirulation vortex veins - ciliary circulation |
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Term
| how does blood leave the retina? |
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Definition
| capillary beds --> venules --> veins --> central retinal vein |
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Term
| How many vortex veins are there? |
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Definition
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Term
| What drains into the vortex veins? Where do vortex veins drain into? |
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Definition
vortex veins drain iris, ciliary body and possibly the canal of schlemm and intrascleral plexus vortex veins drain into the appropriate ophthalmic vein |
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Term
| how many anterior ciliary veins are there? |
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Definition
14 4-superior rectus 4-inferior rectus 4-medial rectus 2-lateral rectus |
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Term
| what is the path the blood takes through the anterior ciliary veins? |
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Definition
| canal of schlemm, intrascleral plexus, episcleral plexus --> anterior ciliary veins --> muscle veins --> appropriate ophthalmic vein |
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Term
| what are two retinal blood vessel anomalies? |
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Definition
cilioretinal artery - looks like hook, instead of stopping at choroid, comes into retina opticociliary vein - veins that were to form vortex vein join central retinal vein instead |
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