How did the brain form?

[futurezoologist]

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

[mith]

It probably formed from nerves; see worm's ganglia/ganglion.

[egocentrism]

from Exoderm !

[alextemplet]

from Exoderm !

My guess would be mesoderm.

[Sepals]

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.

[Darby]

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.

[futurezoologist]

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