Etymology
The word "choroid" is derived from the Greek words "chorion" (skin) and "eidos" (form).
Meaning
The choroid is a thin layer of vascularized connective tissue located between the retina and the sclera. It provides nourishment to the outer layers of the retina.
Origin
The choroid develops from the mesoderm, the middle embryonic germ layer. It differentiates from the optic vesicle, which also gives rise to the retina and the optic nerve. During development, the choroid becomes highly vascularized to support the metabolic needs of the rapidly growing retina.
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