1. Chemically elicited Ameboidism, formulating this way the "Neurotropic theory" (Cajal, 1892)

2. Atropine, pilocarpine, nicotine, and phenyl-ethyl-barbituric acid (phenobarbital) which are known to have neurotropic effects were tested.

3. 19 Objective To evaluate the neurotropic effects of nerve growth factor (NGF) and regeneration chamber fluid (RCF) on the cultured nerve tissue.