Figure 6
Schematic drawings of the choroidal lobule and its electric circuit model. (a) A simple example to explain Kirchhoff’s law. (b) The choriocapillaris of the posterior pole is arranged in a lobular pattern surrounded by the collector venules (cv). The feeding arteriole (*) joins the choriocapillaris at the center of the lobule. The draining venules (dv) are connected to the periphery of the lobules. (c) The electric circuit model of the choroidal lobule is arranged as a dual-layered hexagon. The boundary represents the collector venules (cv), and its electric resistance was set to 1 to 1/16 of the resisters arranged in the inner circuit representing the choriocapillaris. The voltage of the anode (*) was set at the center of the hexagon as 50 V. The cathode (dv) was arranged at the periphery of the hexagon representing the draining venules, and its voltage was set as 10 V. (d) Hexagons were arrayed as 5 × 5 to represent the choriocapillary bed. (e) Disconnecting an anode from one hexagon represents embolism of a single feeding arteriole. (f) Disconnecting anodes from a sector of hexagons represents embolism of a posterior ciliary artery.
