The system is composed of the stomatogastric ganglion ( STG ), oesophageal ganglion and the paired commissural ganglia.
2.
A smaller gastro-oesophageal ganglion lies dorsally to each buccal ganglion and is connected to the latter by a short connective.
3.
The hindbrain is homologous to a part of the arthropod brain known as the sub-oesophageal ganglion, in terms of the genes that it expresses and its position in between the brain and the nerve cord.
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