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How did the brain form?

Discussion of everything related to the Theory of Evolution.

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How did the brain form?

Postby futurezoologist » Wed Mar 11, 2009 9:27 am

Sorry i have little time so im going to have to ask this question bluntly.
i find it amazing how lungs formed from intestines and all that sort of stuff but after some googling i was unable to find how the brain was formed. Was it previously a skeletal muscle or did it form for its current purpose?
Sorry if this has already been asked, i did do a quick search of the forum and was unable to find anything.
Thanks,

Joe
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Postby mith » Wed Mar 11, 2009 5:09 pm

It probably formed from nerves; see worm's ganglia/ganglion.
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Re: How did the brain form?

Postby egocentrism » Wed Mar 11, 2009 8:54 pm

from Exoderm !
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Re: How did the brain form?

Postby alextemplet » Wed Mar 11, 2009 11:17 pm

egocentrism wrote:from Exoderm !


My guess would be mesoderm.
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Postby Sepals » Thu Mar 12, 2009 4:51 pm

To cut a long story short: it formed by a consolidation of nerve cells. Apparantly all animals have similar nerves cells, we just have more, making us more advnced in intelligence. For a good review of the evolution of the brain I recommand "The brain" by Michael O'Shea.
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Postby Darby » Fri Mar 13, 2009 12:28 pm

Do a check on "cephalization."

Sensory and processing cells probably started on the surface (which is probably why even internal systems start as ectoderm) with deeper semi-coordinated connections, as in nerve nets. Better interactions and some under-the-surface protection all would have been advantageous variations.
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Postby futurezoologist » Sun Mar 15, 2009 6:17 am

Thanks, you all helped heaps, i'll start googling those words.
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