From Wikipedia, the free encyclopedia

The supraesophageal ganglion (insect brain) is the first part of the insect central nervous system. It receives and processes information from the first, second, and third metameres. The supraesophageal ganglion lies dorsal to the esophagus and consists of three parts: the protocerebrum, the duetocerebrum, and the tritocerebrum. The lobes of the tritocerebrum split to circumvent the esophagus and begin the subesophageal ganglion. The subesophageal ganglion continues the nervous system and lies ventral to the esophagus. Finally, the segmental ganglia are found in each body segment as a fused ganglion and they provide the segments with some autonomous control.

 

Ryan

Adam

 

http://www.scifiscripts.com/cartoon/finding_nemo_transcript.pdf 

"The supraesophageal ganglion is a similar to our forebrain. It serves a central, integrative, and cognitive function. It recedes information from the optic nerves and other sensory nerves. The subesophageal ganglion is star shaped and is similar to our hind brain. It has a basic motor function, controlling reflexes and automatic functions"(http://cripticspage.com:1991/tarantula/tarant-5.htm)

yes, exactly they should not to be even selfish by themselves. it is just to keep each of them safe in the movie . .!