An anatomico-physiological study of the posterior longitudinal bundle in its relation to forced movements / by L.J.J. Muskens.

  • Muskens, Louis Jacob Josef, 1872-1937.
Date:
1914
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Licence: In copyright

Credit: An anatomico-physiological study of the posterior longitudinal bundle in its relation to forced movements / by L.J.J. Muskens. 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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    have a different origin from that of the crossed vestibulo-mesencephalic bundle. § 5.—Lesion of Bechtereio's Nucleus (Table 1, Group 5, p. 26). This supposition was strengthened as soon as we examined two animals that had sustained a lesion limited to the situation of Bechterew’s nucleus (No. 93, figs. 5a, 5b, 5c, 5cl, and No. 95, figs. 6a, 6b). In these we found this ascending bundle, and also a bundle of fibres descending in the spinal part of the posterior longitudinal bundle degenerated, but only on the side of the lesion. The origin of this ascending bundle could hardly be other than Bechterew’s nucleus. It is then a homolateral vestibulo-mesencephalic bundle (as described by Wallen- berg, Winkler and van Gehuchten) which ascends in the direction of the posterior commissure. The physiological significance of this homolateral ascending bundle which pursues its course lateral to the crossed vestibulo-mesencephalic bundle, appeared closely connected with that of the crossed bundle. This is probable from the fact that animals in which one of these bundles (ciossed oi uncrossed) was degenerated performed circus move- ments to the healthy side (of. §§ 1 and 3 of this chapter), or else conjugate deviation of head and eyes (fig. 5d) was present. The homolateral descending fibres of Bechterew’s nucleus (less in number in cat 95, where Deiters’ nucleus was entirely intact) occupy a more dorsal and lateral position in the spinal part of the posterior longitudinal bundle formation than do the descending homolateral fibres from Deiters’ nucleus. Chapter II.—A Centrifugal Bundle in the Posterior Longitu- dinal Bundle-formation which controls Circus Movement to the Side of the Lesion. Up till now we have become acquainted with two vestibulo- mesencephalic bundles, the mesial one of which is crossed and ascends tram the ventral triangular part of Deiters' nucleus, while the lateral one ascends uncrossed from Bechterew's nucleus. The ascending degeneration of either of these tracts and the associated descending degenerations in the spinal part of the posterior longitudinal bundle e apparent y always accompanied by circus movements or with con- jugate deviation of head and eyes to the non-degenerated side. We
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