Nerve net

A network of nerves or diffuse nervous system is the simplest known type of nervous system in biological organisms. The individual nerve cells are arranged to form networks of nerves, not to coordination centers such as ganglia or brains, but come on concentrations of nerve cells, for example in the area of the throat, so they are not distributed completely diffuse. Neural networks mainly occur in cnidarians ( coelenterates ). The simplest representatives are found in polyps of the genus Hydra.

Neural networks are quite simple in many aspects, and differ greatly from higher nervous systems. So occur predominantly multi-and bipolar nerve cells, which usually have no specialized dendrites or axons, are therefore symmetrical. Also, most EUR between national connections (synapses ) in contrast to those to be forwarded to the higher nervous systems capable of excitations in both directions. This is also the fact that it is normally to electrical synapses, all of the neurons in the diffuse nervous system thus forms a syncytium. The classic, well-known vertebrate neurotransmitters do not occur in neural networks, instead it is mainly neuropeptides, are carrying out the chemical transmission of information.