The centromedian nucleus (C9) is the largest of the nonspecific thalamic nuclei andbelongs to the intralaminar nuclei sur-rounding the medial nuclear complex. It is divided into a ventrocaudal parvocellular part and a dorso-oral magnocellular part. The fibers of the superior cerebellarpeduncle, which terminate in this nucleus,originate from the emboliform nucleus of thecerebellum (C10). Apart from these crossedfibers, the nucleus also receives ipsilateral fibers from the reticular formation (C11). Fibers from the internal segment of the globuspallidus (C12) branch off from the lenticularfasciculus (Forel’s field H2) and radiate into the nucleus. Fibers from the precentral cor-tex (area 4) are thought to terminate here as well. Efferent fiber bundles run from the magnocellular region to the caudate nucleus (C13) and from the parvocellular region to the putamen (C14). These tracts provide a connection between cerebellum and stri-atum.