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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Anatomy and embryology 199 (1999), S. 539-547 
    ISSN: 1432-0568
    Keywords: Key words Brain stem ; Reticular formation ; Interstitial nucleus of the fasciculus longitudinalis medialis ; Descending pathways ; Neuroembryology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Early brainstem-spinal cord projections were studied in the rat using the carbocyanine dye DiI in fixed embryos and biotinylated dextran amine (BDA) in an isolated embryonic brain-spinal cord preparation. A system of staging embryos was used that allows direct comparison with data in other mammals. With both techniques it was shown that in embryos of at least 12 days of age (E12), i.e., at the time of closure of the posterior neuropore, already a variety of brainstem centers innervate the spinal cord. In the interstitial nucleus of the fasciculus longitudinalis medialis and various parts of the reticular formation – mesencephalic, pontine as well as medullary – DiI or BDA labelled neurons were observed. Mainly large immature, bipolar neurons were labeled. In later stages (E13, E14) the number of labeled neurons increased and more mature, multipolar cells were found. Labeled neurons were also observed in the vestibular nuclear complex and in the medullary raphe. Just below the cerebellum a conspicuous small group of neurons was found labeled in a position reminiscent of the locus coeruleus. Comparison with available data on the time of neuron origin of brainstem neurons suggests that interstitiospinal and reticulospinal neurons start projecting spinalwards shortly after they are generated. The earliest brainstem projections to the spinal cord all pass via the fasciculus longitudinalis medialis.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0533
    Keywords: Key words Microcephaly ; Pyramid absence ; Inferior ; olive dysplasia ; Cataract
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In two siblings (a female and a male neonate), severe microcephaly, bilateral absence of the pyramids, severe hypoplasia of the cerebral peduncles, and dysplasia of the inferior olives was found together with microphthalmia, facial malformations and multiple contractures of the extremities. In both cases, the cerebral hemispheres otherwise showed a more or less normal gyral pattern with the insula incompletely covered by the opercula, and a torn but otherwise intact corpus callosum. In case 2, congenital cataract was also observed. The present cases can be characterized as a rapidly fatal, familial syndrome, probably transmitted as an autosomal recessive trait, and have several features in common with the Neu-Laxova syndrome. They differ in having a less severe form of microcephaly, a rather normal cytoarchitecture of the cerebral cortex, an apparently normal corpus callosum, no gross cerebellar abnormalities, and no other organ malformations. The present cases belong to a group of heterogeneous syndromes which have microcephaly, ocular and facial malformations, multiple contractures, and ichthyosis-like skin in common.
    Type of Medium: Electronic Resource
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