Fastigial nucleus
The fastigial nuclei is situated atop the roof of the fourth ventricle (thence its name: "fastigus" is Latin for "summit").[1] The fastigial nucleus is a mass of gray matter nearest to the middle line at the anterior end of the superior vermis, immediately over the roof of the fourth ventricle (the peak of which is called the fastigium), from which it is separated by a thin layer of white matter.[1] Through the vestibulospinal and reticulospinal tracts, the fastigial efferents are involved in regulation of balance and posture as well as axial and proximal limb musculature activity.The Purkinje cell output from the oculomotor vermis relays through the cFN, where neurons directly related to saccadic eye movements are located.[5] This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918) 2° (Spinomesencephalic tract → Superior colliculus of Midbrain tectum)