I am in doubt

Shane O'Mara smomara at mail.tcd.ie
Wed Apr 24 03:29:02 EST 1996


In article <BILL.96Apr19111058 at ca2.nsma.arizona.edu>,
bill at nsma.arizona.edu (Bill Skaggs) wrote:

> jfe0 at bitmailer.net (Javier) writes:
>    > What is nowdays considered as the total number of neurons in our
>    > brain - if possible for the different areas of it - and the total
>    > estimated amount of synapsis? I need that information for a
>    > presentation . 
> 
> The most reasonable estimates give about 50 billion (5x10^10) neurons
> in all, of which about 40 billion are granule cells in the cerebellum.
> About 10 billion are in the neocortex; all other numbers are much
> smaller.  The number of synapses would be around 100 trillion (10^14),
> of which more than 90% are in the neocortex.
> 
>         -- Bill

A good article to start with is Cherniak, 1990, The bounded brain:
Toward a quantitative neuroanatomy, J Cog Neuro, 2, 58-68, which
provides summaries of the varying estimates available and citations
to the key literature.

- Shane.
-- 
Shane O'Mara
Department of Psychology
University of Dublin
Trinity College
Dublin 2

Email: smomara at mail.tcd.ie
Phone: +353-1-608 1174
Fax: +353-1-671 2006
WWW: http: www.tcd.ie/psychology.index



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