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Cerebellovestibular projection from the posterior lobe cortex in the rabbit; an experimental study with the retrograde HRP method.I.Topographical relationships

100%

Bukowska D.

Acta Neurobiologiae Experimentalis

1995

vol. 55

issue 1

23-34

The sources of corticovestibular projections from the cerebellar posterior lobe vermis and hemisphere in the rabbit were investigated by the retrograde horseradish peroxidase (HRP) tracing method. Following ionophoretic injections into various subdivisions of the vestibular nuclear complex (VNC), labelled Purkinje neurones were identified ipsolaterally in all vermal lobules (VI through IX) and some regions of the hemisphere.The results indicate that projection is profuse and directed to all four nuclei of VNC.The labelling suggests some topographical relationships between lobules and especially sublobules of the posterior lobe and individual nuclei of VNC.The major projection derives from lobule VIII whereas that from lobule VII is small.Projection from the hamisphere arise mainly from crus I and crus II of the ansiform lobule.Those from the copula pyramids, lobule HV and the ventral paraflocullus are sparse.In the present study a topographical relationships were more precisely established than before because the technique revealed VNC afferents from iondividual sublobules of the cerebellar posterior lobe cortex.

Cerebellovestibular projection from the posterior lobe cortex in the rabbit; an experimental study with the retrograde HRP method.II.Zonal organization

88%

Bukowska D.

Acta Neurobiologiae Experimentalis

1995

vol. 55

issue 1

35-47

The mediolateral distribution of neurones of origin of the corticovestibular projections from the cerebellar posterior lobe in the rabbit was studied with the retrograde horseradish peroxidase (HRP) tracing method. After ionophoretic injections confined to various subdivisions of the vestibular nuclear complex (VNC), labelled Purkinje neurones were found ipsolaterally in widespreadmediolateral cortical regions of vermal lobules from VI to IX, as well as in crus I and crus II of the ansiform lobule, the copula pyramids, lobule HV and the ventral paraflocullus.However, when projections from individual sublobules were examined, a clesrly visible zonal pattern was found.Thus, Purkinje neurones projecting to VNC were arranged in longitudinal bands with madial and lateral boundaries quite well demarcated.these bands had a different distances from the midline.The present findings constitute the first indication of a zonal organization of corticovestibular projections from individual sublobules of the cerebellar postrior lobe in the rabbit.This zonal arragement of VNC afferents is discussed with the spacial emphasis on the cerebellar longitudinal zones related to previous studies on other species.

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2 Acta Neurobiologiae Experimentalis

2 1995

2 Bukowska D.

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Cerebellovestibular projection from the posterior lobe cortex in the rabbit; an experimental study with the retrograde HRP method.I.Topographical relationships

Cerebellovestibular projection from the posterior lobe cortex in the rabbit; an experimental study with the retrograde HRP method.II.Zonal organization