THE FIBER PROJECTIONS FROM THE CEREBELLAR DENTATE NUCLEUS TO THE NUCLEI OF Ⅲ,Ⅳ AND Ⅵ CRANIAL NERVES IN THE RABBIT / 解剖学报

ABSTRACT

Nine adult healthy rabbits were used in this study.In these animals attemptswere made to produce lesions in different parts of the cerebellar hemispheres.Largelesions of the left cerebellar hemisphere were produced by an aspiration technique.Small lesions of the cerebellar cortex or of the dentate nucleus were produced bystereotaxic electrolysis.All animals were sacrificed 3～7 days after the operation.The brains were cut at 25～30 ? in serial transverse sections on freezing microtome.The sections were stained with Fink-Heimer method.The degenerating fibers and terminals are found in the bilateral nuclei of Ⅲ,Ⅳ and Ⅵ cranial nerves The degenerations are predominant in the contralateraloculomotor nucleus but less in the ipsilateral side.On the contrary,it is slightlydominant in the ipsilateral trochlear and abducens nuclei,but less in the contrala-teral ones.It is shown that these fibers arise from the dentate nucleus.The functional significance of this fibers system is discussed.