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  • 1
    ISSN: 1432-5195
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé. Nous avons proposé une approche intervertébrale à un seul niveau pour décomprimer deux racines de nerfs adjacents ipsilatérales qui étaient impliquées. Cette opération a été réalisée dans 4 cas de radiculopathie cervicale impliquant deux racines de nerfs adjacents. Nous avons effectué une discectomie, une corporectomie partielle et l’ablation de la partie antéromédiale des pédicules ainsi que l’ablation des ostéophytes et du ligament longitudinal postérieur, qui ont été suivies d’une fusion intercorporéale. Il y a eu une diminution de la douleur chez tous les patients et/ou une certaine faiblesse motrice. La fusion rachidienne a été obtenue aves un alignement lordosique normal, sans aucune complication pour l’ensemble des patients. Nous désirons mettre l’accent sur les avantages de cette technique: elle peut conserver le segment en mouvement au niveau d’un disque supplémentaire et elle peut aussi avoir un taux de fusion meilleur qu’une arthrodise corporéale à plusieurs étages.
    Notes: Summary. We describe a single level intervertebral approach to decompress two adjacent involved nerve roots in cases of cervical spondylosis. The operation was undertaken in 4 patients. We carried out discectomy, partial excision of the vertebral body with removal of the anteromedial part of the pedicles, removal of osteophytes and excision of the posterior longitudinal ligament, followed by an anterior interbody fusion. Fusion was achieved with the spine in normal lordosis and without complications. Pain and motor weakness was relieved in every case. This procedure can maintain movement at one additional disc level and has a better fusion rate than multilevel interbody fusion.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-7381
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Nodal and paranodal regions of myelinated sciatic nerve fibres from diabetic (db/db) mice were examined in freeze fracture replicas. In some fibres, the axolemma was found to display abnormalities in the paranodal region. These include shallow, undifferentiated junctional indentations, thinning of the indentations with widening of the non-junctional grooves between them, particle clusters within the non-junctional grooves, and patches in which axolemmal E-face particles are distributed randomly rather than in the form of linear strings within grooves. Nodal structure, in contrast, is hardly affected. Nodal E-face and P-face particle densities indb/db axons are not significantly different from those in age-matched controls, although we found a few examples in which the E-face density fell slightly below the normal range. Occasional fibres showing evidence of paranodal or segmental demyelination were also seen. The results support paranodal pathology as a potential basis for reduced nerve conduction velocity in diabetic nerves but provide no evidence for significant changes in nodal structure or in nodal Na channel density in sciatic nerve fibres of thedb/db mouse.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-7381
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Structurally normal myelin sheaths develop in the spinal cord of juvenile myelin-deficient rats (mdr) 11 days after transplantation of normal fetal spinal cord fragments or cultured cells that do not yet express galactocerebroside. Cultures result in more extensive myelin formation, and in both cases the myelin that forms is located primarily at or near the site of transplantation. Myelin formation also occurs after transplantation of postnatal donor tissue, but the extent diminishes with donor age, and none was seen after transplantation of adult donor tissue over the two-week period studied. Injection of killed tissue, tissue derived from mouse donors or an extract of myelin also did not lead to myelin formation. The results imply that myelin formed in the host following transplantation was generated by oligodendrocytes newly differentiated from donor precursor cells rather than by donor oligodendrocytes that were already mature at the time of transplantation or by host oligodendrocytes that took up components of the injected material. We conclude that exogenous fetal glial cell precursors are able to survive, differentiate and form myelin in the environment of the juvenile mdr spinal cord.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 226 (1990), S. 396-402 
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: We have identified three examples of female Wistar rats exhibiting the tremor and seizures characteristic of the X-linked myelin deficiency (md) mutation, which is ordinarily seen only in males. Cytogenetic study of two of these animals has shown them to have 41 chromosomes instead of the normal 42. The missing chromosome was identified as an X chromosome by G-banding analysis. These animals thus have an XO genotype comparable to that in Turner's syndrome. Anatomically, one of the animals, which was studied in detail, showed no abnormality of the uterus, and the ovaries, although somewhat smaller than normal, were histologically indistinguishable from those in a normal female rat. No evidence of endocardial fibroelastosis was detected, nor was there any anomaly of the aorta. The myelin deficiency in the central nervous system was comparable to that in hemizygous mutant male rats. XO monosomy in the Wistar rat thus has little effect on phenotype and is more comparable to that in mice than to Turner's syndrome in man. The myelin-deficient rat is useful for studies of X-chromosome monosomy since XO females can readily be identified by the neurological syndrome characteristic of the md mutation.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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