Various nervous systems
(a) In cnidarians, nerve cells form a decentralized nerve net. (b) In echinoderms, nerve cells are bundled into fibers called nerves. (c) In animals exhibiting bilateral symmetry, such as planarians, neurons cluster into an anterior brain that processes information. (d) In addition to a brain, arthropods have clusters of nerve cell bodies, called peripheral ganglia, located along the ventral nerve cord. Mollusks, such as squid and (e) octopi, which must hunt to survive, have complex brains containing millions of neurons. In (f) vertebrates, the brain and spinal cord comprise the central nervous system, while neurons extending into the rest of the body comprise the peripheral nervous system.
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