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A study of the functions of the human labyrinth and of the labyrinth tests : with the submission of a design for the assessment of the labyrinth functions.

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Lyrmont, Michel (1972) A study of the functions of the human labyrinth and of the labyrinth tests : with the submission of a design for the assessment of the labyrinth functions. Unspecified thesis, University of Tasmania.

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Abstract

In the General Introduction, the raison Petre of this thesis
was outlined, and its general structure formulated and justified. The major advances made in labyrinthology and the anatomical structure of the apparatus were
outlined in the first two chapters, The purpose of these two
chapters was to provide the reader with an overview of the
status quo of labyrinthdlogy as a discipline, and to familiarize him with the structure of the apparatus, as frequent references to the anatomy of the system were made in subsequent chapters. There exists, in labyrinthology,
a considerable body of disagreement as to what constitutes
an adequate stimulatory technique, and an adequate mode of
response observation. The major areas of contention were
therefore outlined, and then individually investigated in the
body of this thesis. Upon the conclusions thus reached, a comprehensive technique for the assessment of the labyrinth functions was finally formulated.
From the above mentioned investigations,
it was concluded that the so called Second Law of
Ewald is not valid when applied to man. It was also concluded
that of all the stimulatory techniques employed, the rotation
test was the most suitable for the stimulation of the semicircular
canals, provided the stimulation was administered
at threshold. As for the response, it was concluded that
the nystagmus phenomenon is the most acceptable form of
expression of labyrinthine activity, provided a criterion of
occurrence vs non-occurrence was used instead of post threshold
parameters such as duration and amplitude It was also concluded
that to be comprehensive, a technique must include the
stimulation of the otoliths, and that each pair of saccules
and utricles can be independently assessed by the administration
of specific linear accelerations, resulting in an ocular
countermotion response. It was also demonstrated that there
are several patterns of post stimulatory nystagmus which are
said to be expressive of specific pathologies. This however
was proved to be incorrect, as unusual patterns of nystagmus
can occur in normal subjects. A comprehensive assessment technique
was formulated in the last chapter of this thesis. The technique thus formulated in the last chapter permits the individual
assessment of each canal, and the assessment of each pair of
otolithic sub-organs. When a pathology is present on the oculomotor
tract,. the technique permits the location of its precise
site.

Item Type: Thesis (Unspecified)
Keywords: Labyrinth (Ear)
Copyright Holders: The Author
Copyright Information:

Copyright 1972 the Author - The University is continuing to endeavour to trace the copyright
owner(s) and in the meantime this item has been reproduced here in good faith. We
would be pleased to hear from the copyright owner(s).

Additional Information:

Thesis (M.A.) - University of Tasmania, 1972. Bibliography: p. 301-313

Date Deposited: 19 Dec 2014 02:26
Last Modified: 20 Jul 2017 07:55
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