ELECTROTONIC LENGTH ESTIMATES OF CA3 HIPPOCAMPAL PYRAMIDAL NEURONS

Known anatomical and electrophysiological data on CA3 hippocampal pyramidal cells allows equivalent cable representation electrotonic length of an equivalent cylinder expressed in terms of the physiologically-derived electrotonic length parameter corresponding to an exponentially tapering equivalent cable is shown to equal the combined average electrotonic length of apical and basilar dendrites. These estimates of electrotonic length reconcile well with the anatomically-derived estimates on a single-cell basis and confirm that CA3 hippocampal pyramidal neurons are electrotonically more compact than previously found.