Abstract
The P III fraction was analysed on isolated inverted retinas obtained from frogs and turtles by means of the coaxial microelectrode. It was found that the conventional P III consisted of at least two subcomponents; the distal P III arising in the receptor cell layer and the proximal P III originating in a more proximal layer. Latency measurements revealed that the onset of the distal P III occured sooner than that of the proximal P III. Furthermore, these two subcomponents differed in resistivity to ammonia vapor. Utilizing the excised opened frog eye, electrode placement between the origins of the distal and proximal P IIIs resulted in a biphasic deflexion prior to the onset of the b-wave. This deflexion was a consequence of differences in latency and polarity between the P III subcomponents.
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