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Figure 5.6 : (A) One-dimensional neuronal cable. (B) One dimensional slice through the rod
network is analogous to a one-dimensional cable. (C) Because the resistance Ros∕is between
the outer segment of the photoreceptor, which contains the photocurrent, and the inner
segment, which has the gap junctions that couple neighboring cells, is small, the rod can be
modeled as a single compartment.