Experimental approaches to the study of degenerative and regenerative processes in the nervous tissue. I). Morphological changes in the frog cerebellum after unilateral transection of the VIII statoacustic nerve.
The cell density was evaluated in Purkinje neuron and internal granule cell layers of the frog (Rana esculenta L.) cerebellum at 3, 8, 14, or 30 days after unilateral transection of the VIII statoacustic nerve. After 3 days, the cell density of the Purkinje cell layer was markedly reduced, the cellular loss amounting to 30% at 30 days. In the internal granule cell layer (IGL), after an abrupt decrease in the cell density at 3 and 8 days, the number of cells increased at 14 days and reached the values of control animals at 30 days. In the dorsal part of the ependymal lining of the IV ventricle, there was morphological indication of resumption of the proliferative activity. This can be in relationship with the restored cytoarchitecture of the IGL after the initial cell degeneration. All the above changes were evident in both the ipsi and contralateral parts to the neurotomy though at different extent. This is in agreement with the anatomical data about the nervous circuit connection between the two cerebellar sides and may be also expression of vestibular compensation, induced by unilateral nerve transection in the contralateral side.
Vignola
C
C
Dipartimento di Biologia Animale, Centro di Studio per l'Istochimica del C.N.R., Universita' di Pavia.
Scherini
E
E
Valli
P
P
Bernocchi
G
G
D000818:Animals; D002531:Cerebellum / Q000166:cytology* / Q000502:physiology*; D003593:Cytoplasm / Q000648:ultrastructure; D003714:Denervation; D007839:Functional Laterality; D008297:Male; D009410:Nerve Degeneration; D009416:Nerve Regeneration; D009457:Neuroglia / Q000166:cytology / Q000502:physiology; D011689:Purkinje Cells / Q000166:cytology* / Q000502:physiology*; D011893:Rana esculenta; D013997:Time Factors; D014048:Tolonium Chloride; D000159:Vestibulocochlear Nerve / Q000502:physiology*
D014048:Tolonium Chloride