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
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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![G1 This strand of fibres lies therefore in the same region in which Dejerine [45] , Probst [125], and Roussy [135] find that a large number of fibres disappear after lesion of the lateral parts of the optic thalamus. The first question now is where do those fibres go to ? It is interesting to note that Sachs [140], working in Sir Victor Horsley’s laboratory, reported the case of a rhesus, where the lesion lay in the external medullary lamina, and which showed a similar strand of degenerated nerve-fibres. This author believes that those fibres terminate in the red nucleus. From the evidence already discussed, it seems to me more probable that they terminate in the nucleus of the posterior commissure, and, from Bernheimer’s experiments, possibly in the interstitial nucleus of the opposite side. This view is further supported by another case reported by Sachs in which the lesion was in the field of Forel; the same bundle of fibres was degenerated, while some fibres in the posterior longitudinal bundle of the same side also showed degeneration, proving that the interstitial nucleus (at least cells, from which the posterior longitudinal bundle fibres originate) was involved in the lesion. Where doe*s this bundle of fibres described by Sachs [140] and myself originate ? Up to the present time no conclusive evidence on this point has been furnished by our experiments. At the same time I make the suggestion that their origin lies either in the globus pallidus or in the putamen. This theory is suggested by the fact that in none of my cases of lesion involving the cortex alone were these fibres found degenerated, but only when the deeper parts such as the striate body or the lateral parts of the thalamus were involved. It is further supported by the work of Sachs [140], who succeeded in tracing a thalamo-fugal tract, lying in the same situation and following the same course, from the external medullary lamina to the globus pallidus. The data afforded by the pathological cases discussed in Chapter VII, together with the anatomical data supplied by v. Bechterew [11], Ariens Ivappers [3] and de Vries seem also to support this theory. As regards the physiological significance of this bundle the experi- ments of Horsley, Sachs and Clarke [41] appear to speak in the same sense. They tend to prove that faradic stimulation of the posterior third of the lateral nucleus thalami, that is the region in the immediate neighbourhood of the external medullary lamina, causes deviation of head and eyes to the opposite side. My observation quite fits in here. Section of the bundle causes circus movements and conjugate deviation](https://iiif.wellcomecollection.org/image/b22447799_0065.jp2/full/800%2C/0/default.jpg)
