Suprachoroid lamina

On the external surface of the choroid is a thin membrane, the lamina suprachorioidea, composed of delicate non-vascular lamellæ—each lamella consisting of a net-work of fine elastic fibers among which are branched pigment cells. The spaces between the lamellæ are lined by endothelium, and open freely into the perichoroidal lymph space, which, in its turn, communicates with the periscleral space by the perforations in the sclera through which the vessels and nerves are transmitted.