Nerves cultured in artifical medium

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Nerves cannot be cultured in artificial medium due to their complex requirements for growth and differentiation, which are not fully replicable outside their natural environment. Cultured neural networks have been successfully developed, demonstrating capabilities such as learning and memory, as evidenced by research like Baruchi and Ben-Jacob's work on neuro-memory chips and experiments with rat neurons controlling robotic systems. Neurons do not undergo cell division; however, neural stem cells in the brain can differentiate into neurons or glial cells. Once differentiated, neurons typically do not divide, although there are indications that they might revert to a precursor state under certain conditions.
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can nerves not be cultured in artificial medium? why?
do nervers undergo cell division?
 
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'Cultured neural networks' even has its own wiki, it's fairly typical. They can demonstrate learning/memory:

Baruchi I, Ben-Jacob E (2007). "Towards Neuro-Memory Chip: Imprinting Multiple Memories in Cultured Neural Networks". Physical Review E 75.

and of course, there's the cultured rat neurons controlling the robot:

http://spectrum.ieee.org/automaton/biomedical/bionics/rat-brain-robot-grows-up

As to whether neurons divide, There's "younger" cells (neural stem cells) waiting to differentiate in the brain that can turn into either glia or neurons and once you've differentiated into a neuron you can't divide (but I thought I heard something about them being able to go back to their earlier state... not sure whether it was in nature or lab only).

Or maybe it was this:

http://www.sciencedaily.com/releases/2012/01/120130171907.htm
 
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