Fastigius

Fastigius is an adjective based on the Latin "fastigium", meaning summit. Thus it is used to refer to the peak of the fourth ventricle. [cite web|url=http://www.anatomy.usyd.edu.au/glossary/glossary.cgi?page=f|title=Anatomy Glossary|author=by Dr. M. A. (Toby) Arnold] ; closely related to the posterolateral fissure, which divide the lingula from the nodulus of the cerebelar vermis. See also "nucleus fastigius", or more commonly, "nucleus fastigii" or fastigial nucleus.