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Other Platyhelminthes characteristics shared by these creatures is they are bilaterally symmetrical, this means the left and right sides of their bodies are mirror images of each other. They have distinctive head and tail ends and their body contains three cell layers.
The phylum Platyhelminthes is a highly diversified and versatile phylum, a fact that is reflected in the structure of the nervous system (NS), both in its gross morphology and in the cellular types and their secretory inclusions.n addition to nerve cords, well-developed nerve nets or plexuses can be found in all flatworm taxa. These include subsurface, submuscular, pharyngeal and intestinal (=stomatogastric) and reproductive nerve plexuses. In some places, the plexuses are in continuity with both main and minor nerve cords.