The lamina suprachoroidocapillaris of the guinea pig choroid confirmed by the rapid freezing and freeze-substitution method

There is a compact layer (the lamina suprachoroidocapillaris) between the vascular and the choroidocapillaris layer of the guinea pig and rat choroids. The specimens were treated with the rapid freezing and freeze-substitution method. The choroidal melanocytes and their processes were exclusively built up of several layers, and the arterioles and venules passed through this layer. Numerous nerve terminals were seen throughout this layer, which contained small or large-size synaptic vesicles with dense or light core. These results may facilitate further understanding of the microcirculation in the choroidal architecture.