Subdivision of the cerebellar nuclei

Jansen, 1961 Voogd 1964) and primates (Courville and Cooper, 1970 Chan-Palay, 

In rodents and insectivores the separation between the two nuclear groups is less distinct and the connections between the nuclei of each group are more extensive (Korneliussen, 1968a Ohkawa 1957). 

The subdivision of Weidenreich-Ogawa received strong support from the localization of the fibers in the superior cerebellar peduncle. A small medial and a large lateral portion can be distinguished in this pathway in most mammals at its exit from the central nuclei (see in Fig. 102). Experiments in cat (Verhaart, 1956 Voogd, 1964) and rat (Haroian et ah, 1981) have shown that the medial part of the superior cerebellar peduncle takes its origin from the nuclei of the caudomedial group, mainly from the ipsilateral posterior interposed nucleus, and the lateral portion from the ipsilateral anterior interposed and lateral cerebellar nucleus. 

McCrea, 1988). A more realistic approach would be to consider the cells of the y group as the bed-nucleus of the floccular peduncle, and to realize that a distinction between the group y and the superior vestibular nucleus, that receives a major part of the fibers of the floccular peduncle, remains arbitrary (Tan et al., 1995a). 

Some features of the cerebellar nuclei of the cat, the monkey, and the rat shall be discussed in the next sections. The cerebellar nuclei of birds were described by Feir-abend (1983) and Arends and Zeigler (1991a,b). 

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The subdivision of the cerebellar nuclei is closely related to the longitudinal, zonal... 

The cerebellar nuclei in primates were described by Courville and Cooper (1970) and Chan-Palay (1977, Macaca mulatto), Haines (1971, Galago), and Haines and Dietrichs (1991, Saimiri sciurus). The cerebellar nuclei of the human cerebellum were reviewed by Larsell and Jansen (1972) and Voogd et al. (1990). The four nuclei of the subdivision of Weidenreich-Ogawa can be recognized in macaque fascicularis and their topograph-... 

The zonal organization of the efferent connections of the caudal vermis in the rabbit is quite complex, with discrete zones in the lobules IX and X projecting to the fastigial, descending, superior and medial vestibular nuclei, and lateral zones connected to the interposed and different subdivisions of the lateral cerebellar nucleus (van Rossum,... 

Fig. 153. Diagrams showing showing the projections from the various mediolateral projection-zones of the pyramis (lobule VIII) and the copula pyramidis to the cerebellar and vestibular nuclear complexes in the rat. A. Schematic diagram of the posterior surface of the cerebellum. The subdivision of the pyramis and copula are based on the topography of their efferent projections. B. Schematic sagittal diagrams of the cerebellar and vestibular nuclei showing the terminal areas which receive projections from the individual subdivisions of pyramis and copula pyramidis. Abbreviations see Fig. 152. Umetani and Tabuchi (1988).

Fig. 164. The nucleo-olivary projection in the rat. Data from Ruigrok and Voogd (1990). Upper and lower block diagrams represent the cerebellar and vestibular nuclei, and the subdivisions of the inferior olive respectively. According to Ruigrok and Voogd (1990) the cerebellar nuclei and their olivary target nuclei can be considered as a continuum, stretching from the rostral medial cerebellar nucleus, projecting to caudal MAO, to the lateral vestibular nucleus, projecting to the dorsal fold of the DAO. DL = dorsolateral protuberance of the medial cerebellar nucleus DMC = dorsomedial cell column IntA = anterior interposed nucleus IntDL = dorsolateral hump IntP = posterior interposed nucleus lOD = dorsal accessory olive lODM = dorsomedial cell column lOM = medial accessory olive lOP = principal olive Lat = lateral cerebellar nucleus LVe = lateral vestibular nucleus Med = medial cerebellar nucleus VL = ventrolateral outgrowth.

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