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  • Electron microscopy  (1)
  • Electronmicroscopy  (1)
  • 2020-2022
  • 1975-1979  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Developmental aspects of the innervation of skeletal muscle fibers in the chick embryo (1976)
    Springer
    Cell & tissue research 171 (1976), S. 233-251 
    Details
    ISSN: 1432-0878
    Keywords: Motor innervation ; Fiber type ; Myogenesis ; Electronmicroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The M. complexus in the chick, commonly called the hatching muscle, undergoes conspicuous growth during the latter stages of embryonic development. Myogenesis of this muscle was compared to that of M. biceps femoris with regard to development of types of muscle fiber and their innervation. In both muscles β fibers are of relatively uniform size and show little growth in diameter between 12 days of development and hatching; α fibers develop continuously and display a wide range of diameters at all stages. Initial thickenings on the sarcolemma of β fibers where axons are closely approximate were first observed at 10 days of development in both muscles. In both muscles β fibers are innervated prior to α fibers. Terminal axon networks bridge intercellular spaces and contact β fibers in different myogenic clusters, α fibers that develop on the surface membrane of β fibers exhibit focal thickenings of the membrane and some cell projections that are directed toward axon-β fiber contacts. These changes occurred only in α fibers of M. complexus. At 14 days of embryogenesis, the processes of synaptogenesis and of myelin formation are less advanced in M. biceps femoris than in M. complexus. At this stage a fibers were observed to be innervated in M. complexus, but not yet in M. biceps femoris. Each β fiber was observed to be encircled by several preterminal axons. It is concluded that the earlier development of M. complexus is correlated with an equally early development of nerve-muscle interactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00219408
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The structure and innervation of the sinu-atrial node of the mole heart (1976)
    Springer
    Cell & tissue research 172 (1976), S. 345-356 
    Details
    ISSN: 1432-0878
    Keywords: Mole heart ; SA node ; Innervation ; Neuromuscular relationship ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The sinu-atrial node in the heart of the mole, Mogera wogera, contains myocytes which are devoid of atrial specific granules and which may be classified into two types: electron-lucent (majority) and dark (minority). Numerous unmyelinated axon terminals, containing synaptic vesicles, face the nodal myocyte surface with interspaces of less than 300 nm. There are about 6 terminals per myocyte profile and about 10 per profile at nuclear levels. Of a total of 2717 of these terminals 85.2% are 50–200 nm from the nodal myocytes, and 9.6% form closer neuromuscular junctions, with less than 50 nm interspace and some membrane specialization. Such specializations are almost exclusively found in relation to the dark, minority-type of nodal myocyte. Myelinated nerve fibers are also numerous within the mole SA node, and may terminate almost directly on a nodal myocyte. A few nerve fibers contain many mitochondria and may represent afferent endings. Nodal capillaries are smaller and fewer than capillaries in the juxtanodal myocardium, probably indicating a lesser blood supply to the SA node than to the ordinary myocardium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00399517
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    Paper (German National Licenses)
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