# Why cerebellar input fibers use 2 ways to send a siganl to DCN?

Both groups of input fibers of cerebellum (mossy, climbing) start 2 pathways: 1) project directly to the deep nuclei 2) project to cerebellar cortex, which then (after some processing) sends projection back to deep nuclei through Purkinje cells.

What is the purpose of such an architecture?

And closely related question: is the input information to DCN (the first pathway) and to cerebellar cortex (the second pathway) the same?

1) The true purpose of this architecture is not known (yet).

2) Yes, it is the same information, since the signal comes from the same axon (for climbing fibers see e.g. De Zeeuw et al., 1997).