De nervis opticis nonnulisque aliis praeter communem opinionem in humano capite observatis.

Varolio described a new method of dissection which enabled him to observe and describe the pons for the first time. By this new method Varolio was able to make some contributions to the knowledge of the course and termination of the cranial nerves and to trace the course of the optic nerve approximately to its true termination. His name is perpetuated in the “pons varolii”.