Is there any geometrical information in the nervous system?

There has been an increasing interest in analyzing neurophysiology from complex and chaotic systems viewpoint in recent years. For example, although the famous Hodgkin and Huxley model (Hodgkin and Huxley, 1952) has been the basis of almost all of the proposed models for neural firing, the Rose-Hindmarsh model (Hindmarsh and Rose, 1984) is known to be a more refined model because as it has the ability of showing different firing patterns, especially chaotic bursts of action potential, which causes a proper matching between this model behavior and many real experimental data.