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  • 1
    Electronic Resource
    Electronic Resource
    The fine structure of the guinea-pig muscle spindle (1973)
    Springer
    Cell & tissue research 140 (1973), S. 357-368 
    Details
    ISSN: 1432-0878
    Keywords: Muscle spindle ; Guinea-pig ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Nuclear bag and nuclear chain intrafusal fibres are present in guinea-pig muscle spindles. Unlike muscle spindles in other species two types of nuclear chain fibre seem to be present. The electron microscopical appearance of one type of nuclear chain fibre is similar to that of nuclear bag fibres. It is suggested that under tension the nuclei of small nuclear bag fibres become sufficiently displaced to form nuclear chain-like fibres. The frequent occurrence of fibres which combine some of the properties of both nuclear bag and nuclear chain fibres indicates the possible occurrence of a third type of intrafusal fibre. The sensory innervation of guinea-pig muscle spindles is similar to that of the cat and the rat. Three types of motor nerve ending which could be classified according to the complexity of their subneural apparatus were seen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307023
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Quantitative studies on the distribution of myofilaments in intrafusal muscle fibres (1974)
    Springer
    Cell & tissue research 150 (1974), S. 521-527 
    Details
    ISSN: 1432-0878
    Keywords: Muscle spindle ; Intrafusal fibres ; Myofilaments ; Electron microscopy ; Quantitative stereology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Muscle spindles contain two types of intrafusal muscle fibre, nuclear bag fibres and nuclear chain fibres. The intrafusal fibres of rabbit and guinea pig spindles have been studied using quantitative stereological techniques at the ultrastructural level. The crosssectional areas occupied by myofilaments have been measured in the polar and equatorial regions of both types of intrafusal fibre. There are considerably fewer myofilaments in the equatorial regions of both types of fibre compared with their polar regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00225975
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Observations on the primary sensory ending of tenuissimus muscle spindles in the cat (1986)
    Springer
    Cell & tissue research 246 (1986), S. 309-319 
    Details
    ISSN: 1432-0878
    Keywords: Muscle spindle ; Sensory innervation ; Mechanosensory transduction ; Morphogenesis ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The arrangement of preterminal and terminal axon branches in the primary sensory endings of cat tenuissimus muscle spindles was studied using whole-mount and serial-section techniques. Although in every case one firstorder preterminal branch was supplied exclusively to the bag1 type of intrafusal muscle fibre, the preterminal branching patterns differed considerably in detail. Terminals varied widely in size and location. Their precise form varied according to their position on the intrafusal muscle fibres rather than their relationship to preterminal branches. Terminals derived from separate preterminal branches remained separate and did not fuse with themselves or each other. Individually bag1 fibres had most terminals, chain fibres least. The surface of the muscle fibres were differentially indented by the terminals, least in bag1 fibres and most in chain fibres. The results are discussed in relation to mechanosensory transduction and to the factors involved in determining the form of the primary ending.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00215893
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    A possible role for placental lysosomes in the formation of villous syncytiotrophoblast (1977)
    Springer
    Cell & tissue research 178 (1977), S. 411-419 
    Details
    ISSN: 1432-0878
    Keywords: Human placenta ; Lysosomes ; Differentiation of cytotrophoblast ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary An ultrastructural and ultrahistochemical study of first trimester human placentae confirms previous reports that the cytotrophoblastic cells show a spectrum of differentiation, that dissolution of the limiting membrane of the cytotrophoblastic cells occurs and that fragments of free membrane can be found in the syncytiotrophoblast. There is an aggregation of primary lysosomes in the region of approximation of the cytotrophoblast to the syncytiotrophoblast, free lysosomal enzymes are found in the space between the two trophoblastic components, secondary lysosomes have been noted in the vicinity of fragmenting cytotrophoblastic cell membrane and the incorporation of a segment of free membrane into a vesicular structure has been noted. It is suggested that placental lysosomes mediate the dissolution of the cytotrophoblastic cell membranes that is a necessary prerequisite for their full differentiation into syncytiotrophoblast and it is further suggested that one of the principal roles of placental lysosomes is in the structural refashioning of the organ that occurs during the first trimester.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00218704
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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