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Like humans, cephalopods like squid have highly developed nervous systems. However, they are organised very differently to those of vertebrates, being far less centralised. In squid and octopuses, a large proportion of their neural mass is located in their arms, rather than what would be traditionally considered their brain. The Brachial ganglia are simply the large neural masses that are found in the arms of the squid, giving each tentacle a large degree of independence, and operating alongside the brain.

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