Basic Aspects of Central Vestibular Mechanisms by A. Brodal, O. Pompeiano PDF

By A. Brodal, O. Pompeiano

ISBN-10: 0444410481

ISBN-13: 9780444410481

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Finally I wish to turn to the problem of neuro-transmission from and to the vestibular hair cell, by mentioning unpublished results obtained by Osborne and Thornhill, also members of our vestibular team. It is now well-known that two different kinds of synapse are found associated with the hair cell. The afferent synapse is characterized by synaptic electron-dense synaptic bars surrounded by a halo of synaptic vesicles, whereas the efferent synapse consists of a bag-like membrane structure opposite the efferent (centrifugal) nerve endings which themselves are crowded with vesicles.

Traces 1 and 2 are the output from two accelerometers in antiphase. The acceleration and deceleration happened to be near the response threshold of the accelerometer. Trace 3: The integrated response from a single unit. Upwards deflexion: excitation; downwards deflexion: inhibition. Records A and B demonstrate that the preparation showed the 'classical' response picture of a horizontal semicircular canal unit. Total time 3 min. Ordinate: Relative value of integrated voltage. C, Response of the same preparation to constant-speed tilting from normal to nose-up to upside-down to nosedown to normal and D, From side down to nose-up to side-up to nose-down to side-down, in which positions the preparation was left stationaiy for some time.

B R O D A L retrograde changes. Both methods have their advantages and drawbacks. When one traces degeneratingjbres following a lesion in a nuclear complex like the vestibular, there is always considerable risk that fibres other than those which take origin from the destroyed nuclear region have been damaged. Fibres from extravestibular sources, for example the fastigial nucleus, pass through some of the vestibular nuclei, and fibres from one nuclear group often traverse another before leaving the complex.

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Basic Aspects of Central Vestibular Mechanisms by A. Brodal, O. Pompeiano


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