The purpose of this paper is to emphasize the influence of the mesencephalic oculomotor system regulation on orthostatic postural regulation. The body at rest is never immobile but it swings continuously. The amplitudes and the frequencies of body sway give an indication of the function of the different sensorimotor loops which are involved in body balance. An apparatus, the statokinesimeter, allows us to record these motions by means of displacement of the body's centre of gravity with respect to the centre of the basis. In the case of head or cervical injuries, the brain stem is often implicated giving a partial nuclear unilateral lesion of the III nucleus; double vision of a few degrees with picture separation of never more than 4° occurs. A compensory deviation of the head follows. A conflict between afferents from the III, IV, VI, VIII, XI and supraspinal nuclei occurs. The amplitude and the frequency of the body sway change. A form of treatment is proposed for the ‘pseudo‐vertigo’ of post‐concussional syndrome.
Three posture asymmetries and their connections were assessed by a statistical study as rigorous as possible on the subjects of a sample from a population considered as normal after negative criteria. The comparison of probabilities observed with random probabilities shows that there is less than one chance in a thousand to make an error by rejecting the hypothesis that the asymmetries of the orthostatic posture are random. The definition of the limits of these asymmetries thus fits in the search for the conditions of a clinical examination of the posture.
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