how many neurons?

[Hannah Dvorak-Carbone]

In article <347C38C8.58B0 at iname.com>, barton at iname.com says...

>I've heard that some octopuses have not more than seventy neurons or so.
>That's quite a few compared to human brain. 

Whoever you heard this from is extremely misinformed.  Octopuses have 
perhaps the most highly developed brains of all invertebrates.  I would 
guess that their neurons number at least in the millions.

Even the lowly nematode, C. elegans, has something like 300 neurons.
That might be someplace to start.  All the individual cells, including
the neurons, of C. elegans have been identified.

- Hannah Dvorak-Carbone

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Hannah Dvorak-Carbone
Division of Biology 216-76
California Institute of Technology, Pasadena, CA 91125