Abstract
The spread of hyperpolarizing current injected into the salivary gland of the snail Helisoma trivolvis was studied with the technique of multiple site optical recording of transmembrane voltage (MSORTV). Using MSORTV it was possible to monitor simultaneously the spread of current passed by an intracellular microelectrode in up to 124 separate gland regions. Our results demonstrate the feasibility of combining conventional intracellular injection techniques with MSORTV to visualize 2-dimensional current spread in an electrical syncitium.
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