ISSN 1612-3352

Editors in Chief

Prof. Dr. Claus F. Claussen, Neurootological Research Institute of the Research Society for Smell, Taste, Hearing and Equilibrium Disorders at Bad Kissingen (4-G-F). Bad Kissingen, Germany.
Dr. med. Julia M. Bergmann,
Dr. med. Guillermo O. Bertora,
Otoneuroophthalmological Neurophysiology,
Buenos Aires, Argentina.

Production Managers

Dr. med. Julia M. Bergmann,
Dr. med. Guillermo O. Bertora,
Otoneuroophthalmological Neurophysiology,
Buenos Aires, Argentina.


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The influence of cerebellar lesions on the otolith postural reflexes-experimental study

Abstract

Between main postural reflexes, there are tonic labyrinth reflexes generated in otolith system as a results of earth gravity. The neck extensors action is a result of these reflexes and the medullar structures are their centers. It is known that the rigidity of decerebrated animals is caused by the fastigial nucleus damage and that this nucleus is connected with nodulus.
The aim of the study was to estimate the disturbance of the otolith postural reflexes after partial cerebellectomy in pigeon. We measured, in ablation experiments, changes of head position during body rotation around transversal axis. In these manoeuvres, vector of earth gravity form otolith reflexes and it makes possible keeping the head in horizontal plane.
The results of our experiments- hemicerebellectomy and vermis ablation-showed the normal reflexes after hemicerebellectomy and great disturbances of these reflexes after vermis ablation.
Our observations support the outlook that in cerebellar structures vermis (nodulus and fastigial nucleus), not flocculus plays the serious role in controlling the vestibular reflexes.
( The postural reflexes in experiments were registered on CD)

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