Modelová Otázka ID 2494 - 
Žebříčkovitou nervovou soustavu nalezneme u:
Správná odpověď je: D
U dvoustranně souměrných živočichů (Bilateralia) začíná docházet k centralizaci neuronů. Neurony tvoří shluky zvané ganglia. Pro žebříčkovitou nervovou soustavu kroužkovců je typický výskyt jednoho páru ganglií v každém tělním článku. Tato ganglia jsou mezi články spojena nervovými pruhy. Pár ganglií v rámci jednoho článku je spojen příčnými komisurami. Tak soustava získává žebříkovitý vzhled. U ploštěnců a měkkýšů bychom nalezli nervovou soustavu gangliovou, u ostnokožců je nervová soustava druhotně redukována a ganglia chybí, nervová soustava obratlovců (včetně paryb) je trubicovitá.
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