Origin of the neuro-sensory system: new and expected insights from sponges.

@article{Renard2009OriginOT,
  title={Origin of the neuro-sensory system: new and expected insights from sponges.},
  author={Emmanuelle Renard and Jean Vacelet and Eve Gazave and Pascal Lap{\'e}bie and Carole Borchiellini and Alexander V. Ereskovsky},
  journal={Integrative zoology},
  year={2009},
  volume={4 3},
  pages={
          294-308
        }
}
The capacity of all cells to respond to stimuli implies the conduction of information at least over short distances. In multicellular organisms, more complex systems of integration and coordination of activities are necessary. In most animals, the processing of information is performed by a nervous system. Among the most basal taxa, sponges are nerveless so that it is traditionally assumed that the integrated neuro-sensory system originated only once in Eumetazoa, a hypothesis not in agreement… 

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