Figure 3
Electric circuit simulation of the choroid. (a–c) The normal choroid shows that electric currents follow the voltage gradient and do not cross the boundary of the hexagon. As the resistance of the boundary becomes lower, the blood flows become more evenly distributed in the hexagon. (d) When one anode is disconnected from the hexagon, the voltage gradient is reversed. Electric currents flow from the adjacent hexagons and cross the boundary to the disconnected hexagon, but at very low level. (e) Reduction of electric current is more severe in sectorial disconnection. Diameter ratio indicates ratio of the collector venule at the lobular boundary and the choriocapillaris. Electric resistance is inversely proportional to the fourth power of the radius (r4) by Poiseuille’s equation.
