current sinks and sources in hippocampal neurons (correction)

Venkatesh Murthy venk at
Thu Feb 11 13:50:38 EST 1993

In article <1le311INNbjg at> venk at (Venkatesh Murthy) writes:


>The EPSP is usually due to synaptic currents flowing INTO the dendrites - in 
>other words, the sink is more distal to the soma (and your recording
>electrode in the cell body layer.  So at the location you are recording
           is in the cell body layer).

>from there is in effect a source.  When the population spike occurs,
>presumably many of the cells are spiking.  This causes a great big sink
>to occur near/at the some since by far most of the action potential

>currents are dominant at the soma (if not by density of channels, by 
>sheer number).  So, your recording electrode is seeing a sink and it 
>records a "negative" potential.  
>Can someone else confirm or refute this?  Bill Calvin, maybe?

Sorry for the typos!

-Venki Murthy
Physiology & Biophysics, SJ-40
University of Washington
Seattle, WA 98195
(venk at

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