Which of the following structures (labeled in the photo above) is responsible for the blood supply of the choroid?
Vitreous / Retina / Choroid
Anatomy
No
U
D
The blood supply of the choroid is derived from the short posterior ciliary arteries (labeled "D"). There are approximately 20 short posterior ciliary arteries (and 10 short posterior ciliary nerves) that enter the globe in a ring around the optic nerve (labeled "A").
The arterial pressure in the choroidal vasculature is much lower than that arriving via the short posterior ciliary arteries because the blood is rapidly re-distributed by a network of choroidal vessels. The outer layer of (large-diameter) choroidal vessels is called theHaller layer while the inner layer of (smaller-diameter) choroidal vessels is called the Sattler layer.
Label "A" corresponds to the optic nerve; "B" to a vortex vein; "C" to the inferior oblique; and "E" to the superior oblique.
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