Abstract
We have studied the development of choroidal vasculature using intravascular injection of Indian ink and neoprene latex and conventional histology. The primitive choriocapillaris forms during the first 2 months; the layers, which eventually become Haller’s layer and Sattler’s layer form above it during the 3rd and 4th and during the 4th and 5th months, respectively. Both layers contain both venous and arterial vessels from the initial stages of their formation. During the last 4 months of gestation the density and differentiation of choroidal vessels continues to increase. In the region of the vascular tunic there are numerous interarterial and some sporadic arterio-venous anastomoses. Recurrent branches of the system of anterior ciliary arteries connect with the anterior part of the choroid. Those branches of the short posterior ciliary arteries that supply the macular zone of the choroid follow a course markedly different from the one taken by all other short posterior ciliary arteries.
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