Membranes of the Orbit
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Let's discuss the membranes of the globe in
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a little bit more detail.
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As I mentioned,
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the sclera is the most outer portion of the membranes and
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becomes continuous with the cornea far anteriorly.
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The next membrane to talk about is the choroid.
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As I mentioned,
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the choroid goes far anterior and communicates with the
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ciliary body at the level of the lens of the eye.
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The third membrane is the retina.
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The retina is seen in yellow here
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and as I mentioned previously,
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it ends at an area called the ora serrata at that junction
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with the 10:00 and 02:00 on the globe and does
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not go as far anteriorly as the choroid.
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This helps you in identifying retinal detachments which
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stop at 10:00 and 02:00 from choroidal detachments
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which will go all the way up to the lens.
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These detachments occur between the different layers
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of the membranes, as you can see here.
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This is the vitreous
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compartment and you can have a collection which occurs
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between the edge of the vitreous and the retina
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and this is the post-hyaloid or subhyaloid space.
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You may also have a collection between the sensory and
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retinal pigment epithelium of the retina
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which would be in the subretinal space.
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There is also a space between the choroid
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and the sclera which is termed the suprachoroidal space.
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And finally, although it's unusual to see,
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you can have a collection that is between the choroid
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and the retina in the subchoroidal space.
David M Yousem, MD, MBA
Professor of Radiology, Vice Chairman and Associate Dean
Johns Hopkins University
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