In the nerve nets of cnidarians and ctenophores, conduction is unpolarized – it can run in any direction through the network of neurons. A central nervous system coordinates the various parts of the body of bilateral animals but not of sponges or radially symmetrical animals. read more
They have a nervous system refered to as a nerve net. They do not have a brain, or cns, although recent discoveries have contested this. They have eyes, can make decisions, have memory, sleep, and feel. read more
A central nervous system coordinates the various parts of the body of bilateral animals but not of sponges or radially symmetrical animals. A few of the texts point out that some jellyfish have ganglion-like structures, but they stop short of suggesting a centralized nervous organization. read more
The thing is, while jellyfish don’t have a brain or central nervous system, they do have a very basic set of nerves at the base of their tentacles. These nerves detect touch, temperature, salinity etc. and the jellyfish reflexively respond to these stimuli. read more