The cerebellar projection from the paratrigeminal nucleus in the cat.

The cerebellar afferent projection from the paratrigeminal nucleus (PTN) was studied in the cat by means of retrograde axonal transport of horseradish perioxidase (HRP). Most of the afferent fibres reach the cerebellar lobules I, II, V (hemispheral part), VIIIB and IX, the paramedian lobule and the fastigial nucleus. The total distribution of the cerebellar afferents is shown in Fig. 2. The findings extend Chan-Palay's [2,3] recent studies on the cytology, synaptic organization and neurotransmitter content of the paratrigeminal nucleus in monkey and rat.