(a) The two-parameter bifurcation diagram shows the curves of fold bifurcation (the red curve f), homoclinic bifurcation (the green curve homo), subcritical Hopf bifurcation (the blue curve subh), fold bifurcation of limit cycle (the purple curve l), together with projection of the trajectory of the full system (black-colored curve). (b) Fast-slow decomposition and bifurcation analysis on somatic part of the MB. The bursting in somatic part of MB is “fold/homoclinic” bursting.