  In this article, we discuss the dynamics of the 3-dimensional FitzHugh-Rinzel
(FHR) model and a class of non-homogeneous FitzHugh-Nagumo (Nh-FHN)
Reaction-Diffusion systems. The Nh-FHN models can be used to generate relevant
wave propagation phenomena in Neuroscience context. This gives raise locally to
complex dynamics such as canards, Mixed Mode Oscillations, Hopf-Bifurcations
some of which can be observed in the FHR model.
