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  • 1
    Electronic Resource
    Electronic Resource
    Neuroembryogenesis in the hippocampal formation of the rat (1974)
    Springer
    Anatomy and embryology 144 (1974), S. 173-186 
    Details
    ISSN: 1432-0568
    Keywords: Hippocampus ; Neurogenesis ; Autoradiography ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summay The prenatal ontogeny of the hippocampus, including the anterior continuation and induseum griseum, was examined in the rat by means of tritiated thymidine autoradiography. The neurons of the anterior continuation formed between the 16th and 18th days of embryonic development. The neurons of the induseum griseum were formed on the 16th and 17th days of gestation. The pyramidal cells of ammon's horn were formed during the 16th, 17th, 18th, and 19th days of embryogenesis but were preceded by the large interneurons of the stratum lacunosum-moleculare which formed on days 15 and 16 of embryonic life. The granule cells of the superficial layers of the stratum granulosum formed during the 20th, 21st, and 22nd days of gestation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00519773
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Nature and significance of spontaneous degeneration of axons in the pyramidal tract (1972)
    Springer
    Anatomy and embryology 136 (1972), S. 98-114 
    Details
    ISSN: 1432-0568
    Keywords: Degenerating axons ; Pyramidal tract
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary During postnatal development of the rat the nature of spontaneous degeneration of axons in the pyramidal tract was studied electron microscopically. The degenerating axons were found more frequently in young animals than in old animals, and they were generally found in bundles. On the basis of electron-opacity and visibility of ultrastructural details in the degenerating axons, and frequency of their occurrence at various developmental stages the degenerating axons were classified into four groups representing four stages of severity of spontaneous degeneration of axons in the pyramidal tract. In the context of neuroembryological material, autoradiographic as well as silver-impregnated, it was established that these spontaneously degenerating axons arose from the reticular formation of the brain stem and that they had ascending as well as descending components, the latter descending in the spinal cord. Possible significance of such reticulo-spinal axons in the primitive organization of the embryonic nervous system and its determination of the spontaneous motility in early embryos, and in the apparently directed growth of the cortico-spinal axons during late stages of embryonic development are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00521105
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    Paper (German National Licenses)
    Fulltext
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