Rolling movements and the ascending vestibulary connections : (fasciculus Deiters ascendens) / by L.J.J. Muskens ; [communicated by J.K.A. Wertheim Salomonson].

  • Muskens, Louis Jacob Josef, 1872-1937.
Date:
1913
Catalogue details

Licence: In copyright

Credit: Rolling movements and the ascending vestibulary connections : (fasciculus Deiters ascendens) / by L.J.J. Muskens ; [communicated by J.K.A. Wertheim Salomonson]. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    takes place, to the side of the lesion. *) Usually shortly after the operation a rotation of the eyeballs around their anteroposterior axis in the same direction is present and also mystagmiform movements of the eyeballs, slow in the sense of the rotations and rapidly back to the normal position (loc. c.it.). In the latter stages the only sympton recalling the movements is a tendency to lie down on the operated side, or even a slighter resistance, if one tries to push the animal on that flank. All this is in accordance with the older experiments of Flourens, Schiff and Cyon and the more recent ones of Evvald, Winkler, Bartels etc. about lesions of the semicircular apparatus and section of the N. acustico-vestibularis. As soon as the rolling movements are completely compensated, it is easy by blindfolding the animal, by causing an emotion or by the dropping experiment of Marey (the normal animal lift up by its feet and dropped unvariably comes down on its feet) to bring about again the original rotation. Also in epileptic fits the rotation may reappear. It is peculiar that in ether-narcosis sometimes a rotation in the inverse sense was noted.2) All this being the rule for experimental animals, whether it be exclusively the vestibulary root, or also the acoustic nerve, the tuberculum acusticum, the corpus restiforme and the crus medium cerebelli, are simultaneously hurt, for the anatomical connections of the N. Vestibularis those individuals especially have value, whereby — more or less by accident — exclusively the vestibulary root was partly or totally degenerated. Here I must mention rabbit V, where the pars petrosa cerebelli was extirpated and as an exclusive associated lesion the N. Vesti- bularis happened to be hurt. Here we could follow up the degene- rated nerve-sheaths pre-eminently to three celgroups : to the trian- gular part of the Deiters Nucleus and its descending Ramus, to the ]) The direction of the locomotion associated with the forced movements, is judged by the original position of the animal itself. As also this does not preclude the mixing up of these conditions (e g. a sick person, lying in bed on the back- side, presents negative geolropy, compared with all other mammals), the primary position of the animal is always reduced to that of t.he simplest vertebrate with the simplest forced movements, viz. of fishes. This detail will prove of importance as soon as we proceed from the analysis of the forced movements towards that of the various pathological conditions of the ocular movements and towards that of the various pathological conditions of the ocular movements, conjugated deviations and other neurological syndroms. '-) Compare Risien Russf.lt., Phil Transaction CL XXXV, p. 837, 1894 and Rothfeld Pfluger’s Archiv. Vol. 49, p. 440, 1912.