Trigemino‐cerebellar fiber connections in the goat studied by means of the retrograde cell degeneration method

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Abstract
In this study lesions were placed in the cerebellum of young goats and the trigemino‐cerebellar connections investigated by means of the method of retrograde cell degeneration. The preparations were stained according to the Klüver‐Barrera and the thionin methods. It was found that fibers arising from the spinal Vth nucleus (its nuclei oralis and interpolaris) enter the cerebellum via the homolateral restiform body and seem to terminate in the anterior vermis. Additionally, the existence of distinct ventral cellular group in both the chief sensory and the spinal Vth nuclei was pointed out. This group was found to project also to the cerebellum (very possibly the flocculus), as degeneration was absent from this group in experiments with the floculus completely intact. The chief Vth nucleus proper was found in these experiments to be intact except for a few degenerated cells lying dorsal to the ventral group. Finally, the mesencephalic root nucleus exhibits also retrograde cell degeneration but only in cases where the brachium conjunctivum (homolaterally) has been partly lesioned.