Ocular circulation

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11 Terms

1
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•2 separate system of blood vessels to eye:

CRA - inner 2/3 (NFL --> OPL)

chorocapillaris - outer 1/3 (Photoreceptors --> ONL)

2
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how do retinal blood vessels get to the eye

center of physiological cup

3
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how do veins get to the eye

travel with arteries as they enter globe through ONH

4
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arterioles vs venulues

arterioles:

•Narrower and lighter; brighter and straighter

no pulse

•There is a linear reflex along vessel center (middle 1/3) of the vessel)

venulues:

•Wider, darker and duller

•More curved or tortuous

•Have little if any reflex

5
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•Assess the A/V ratio beyond the ___ Bifurcation

2nd

6
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blood flow heart to brain

•Aortic arch:

-Brachiocephalic artery --> Right common carotid --> internal and external cc

-Left common carotid artery --> internal and external cc

-Left subclavian artery

<p>•Aortic arch:</p><p>-Brachiocephalic artery --&gt; Right common carotid --&gt; internal and external cc</p><p>-Left common carotid artery --&gt; internal and external cc</p><p>-Left subclavian artery</p>
7
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CRA capillary networks

˃inner capillary plexus (ganglion cell layer)

˃outer capillary plexus (inner nuclear layer)

<p>˃inner capillary plexus (ganglion cell layer)</p><p>˃outer capillary plexus (inner nuclear layer)</p>
8
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2 blood retinal barriers

1. outer = tight junction of RPE apical side

2. inner = nonleaky tight junctions of endothelial cells of CRA (retinal vessels)

9
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what ocular tissue has the highest blood flow

choroid

10
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perfusion pressure =

•P = P (arterioles) - P (venules)

-P(arterioles) = 65-70 mm Hg

-P(venules) = intraocular pressure

11
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BV diameter is regulated by what in choroid and retina?

-Autonomic Nervous System

•CHOROID, CILIARY BODY, IRIS

•NOT IN RETINA

-Autoregulation

•RETINA, CILIARY BODY, IRIS

•NOT CHOROID