Capillary lamina of choroid

[1] The choriocapillaris consists of a dense network of freely anastomosing highly permeable fenestrated large-calibre capillaries.

The cell membrane is reduced to a single layer at the fenestrations, facilitating the movement of material through the vessel walls.

The choriocapillaris is densest in the macular area, where it is the sole blood supply for a small region of the retina.

[5] The choriocapillaris serves multiple functions that include sustaining the photoreceptors, filtering waste produced in the outer retina and regulating the temperature of macula.

[6][7] The capillary wall is permeable to plasma proteins which is probably of great importance for the supply of vitamin A to the pigment epithelium.