Cerebellar afferents from the trigeminal sensory nuclei in the cat

Abstract

The cerebellar afferent projection from the trigeminal sensory nuclei (TSN) was studied by means of retrograde axonal transport of horseradish peroxidase (HRP). The projection is almost exclusively ipsilateral. Three cortical regions, viz., the intermediate-lateral part of lobulus simplex with the adjacent area of lobule V, the rostralmost folia of the paramedian lobule with the surrounding parts of crus I and II, and lobule IX, especially its rostral two folia, are the main targets for the cerebellar afferent fibres. A few fibres reach also the other cerebellar regions, as shown in Fig. 3. Most of the cerebellar afferent fibres originate in the nucleus interpolaris with nucleus oralis as the second most important region. The projection from the principal nucleus is moderate and reaches primarily the area of the crura bordering on the paramedian lobule and lobule IX. The projections from the nucleus caudalis and nucleus mesencephalicus are scanty. The fibres from the latter reach only the vermal region. The findings are discussed in relation to previous anatomical and physiological observations.

Migratory routes and fates of cells transcribing the Wnt‐1 gene in the murine hindbrain

“…In addition, a small cluster of stained cells are present between the principle sensory and motor trigeminal nuclei, in an area called the intertrigeminal nucleus. The rostrocaudal distribution of stained cells in the trigeminal nuclei is similar to the distribution of the trigeminal neurons projecting axons to the cerebellum, as both are most frequent in the pars interpolaris and least frequent in the pars caudalis (Somana et al, 1980;Steindler, 1985;van Ham and Yeo, 1992). However, the dorsoventral distribution differs because stained cells are mainly located dorsally, whereas trigeminocerebellar neurons are located both dorsally and ventrally (Ikeda, 1979;Yatim et al, 1996).…”

Eyeblink‐related areas in human cerebellum as shown by fMRI

“…The present findings are essentially consistent with electrophysiological and histological studies showing that the main mossy and climbing fiber input from the face is to ipsilateral lobule H VI. Additional input to lobules H V and H VII and bilateral projections have also been described [Carpenter and Hanna, 1961;Cody and Richardson, 1979;Darian-Smith and Phillips, 1964;Dunn and Matzke, 1968;Hesslow, 1994;Ikeda, 1979;Miles and Wiesendanger, 1975;Snider, 1943;Snider and Stowell, 1944;Somana et al, 1980;Stewart and King, 1963;van Ham and Yeo, 1992].…”

Organisation of reciprocal connections between trigeminal and vestibular nuclei in the rat

“…Substantial projections from all subdivisions of the trigeminal nuclei were previously observed to terminate within lobules IX and X, the flocculus and ventral paraflocculus of the vestibulocerebellum (Watson and Switzer, 1978;Somana et al,1980;Langer et al, 1985;Ikeda and Matsushita, 1992;Van Ham and Yeo, 1992;Yatim et al, 1996) and now in large regions of the VN. Because these cerebellar regions are largely involved in oculomotor control, it would be important to know whether the trigeminovestibular fibres observed here are collaterals of these trigeminocerebellar ones.…”