grey vs white brains' surface

Kalman Rubinson kr4 at nyu.edu
Sat Oct 6 15:07:48 EST 2001


On Sat, 06 Oct 2001 18:36:49 GMT, REMOVE_CAPShelbrecht at gmx.net
(Wolfram Sieber) wrote:

>Hello group,
>
>(I had to move, so i was a while away. Now i am back. :)
>
>During further thinking on the job of a neuron, i came to the
>question, if grey and white components of brain exist on any kind
>of brain. That means: as well on a human brain as on a
>Drosophila's "brain".
>
>Do you know of any animal with brains not divided into these two?

The color distinction is not useful except for giving regional
directions.  The white is white because of the density of myelin.  The
gray is gray because it has less myelin.  Thus, animals lacking
myelin, e.g., lamprey, can be regarded as all grey or neither!

Besides, Drosophila is an invertebrate whose CNS consists of numerous
ganglia rather than a single 'brain.'  In other words, the question is
irrelevant.

Kal




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