Perihypoglossal and secondary vestibular projections to lobules VI and VII of the cerebellar cortex: An HRP study.

Horseradish peroxidase (HRP) was injected into (1) lobule VI; (2) lobule VII; (3) lobule VI and VII of the cat's cerebellar vermis. Marked cells were found in two groups of nuclei related to the vestibulo-ocular system; (a) the three perihypoglossal nuclei: praepositus hypoglossi, nucleus of Roller and intercalatus of Staderini and (b) two areas of the secondary vestibular complex located within the medial and the descending vestibular nuclei. It is concluded that fibers from the perihypoglossal and the secondary vestibular nuclei project to both lobule VI and lobule VII of the cerebellar cortex.