The generation of full system bursts can be triggered by dendritic relaxation oscillations.^[13] (a) Bifurcation diagram of the fast subsystem with bifurcation parameter [Ca]. The solution of the full system when I = 0 (olive) is also superimposed. The bursting arises through a saddle-node on an invariant circle bifurcation and disappears via subcritical Hopf bifurcation. (b) The trajectory in the dendritic subsystem when [IP₃] = 0.96. [Ca]-nullcline is the S-shaped curve in blue and l-nullcline is the olive diagonal curve cutting through the figure.