A brain of Tritonia diomedea
The brains of sea slugs have become quite important
animals in the study of learning and behavior. These animals have a relatively
simple nervous system with extremely large neurons which can be individually recorded
and stimulated.
The brain looks like a beaded ring
surrounding the esophagus near the buccal mass. There
are cerebral, pleural, pedal and buccal ganglia, all
are paired. In some groups, the
cerebral and pleural ganglia appear to be fused just like Tritonia.
The brain has approximately 8000 neurons.