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  • 1
    Electronic Resource
    Electronic Resource
    Study of the origin of connective tissue sheaths of peripheral nerves in the limb of avian embryos (1988)
    Springer
    Anatomy and embryology 178 (1988), S. 553-557 
    Details
    ISSN: 1432-0568
    Keywords: Origin of ; Epinerium perineurium ; Endoneurium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Quail-chick and chick-quail chimeras were constructed by grafting, isotopically, the limb bud of quail embryos into a chick of the same developmental stage and vice versa, prior to the entry of nerve fibres into the limb. After 5–14 days reincubation of the embryos, the components of the connective tissue sheaths of the peripheral nerves were observed by using Feulgen-Rossenbeck staining and light microscopy, in order to distinguish quail cells and chick cells. In all the chimeras studied, the connective tissue sheaths of peripheral nerves (the epineurium, perineurium, perineural septa and endoneural fibroblasts) were formed from the mesenchyme of the limb bud, while Schwann cells were of host origin. Also the outer and inner capsule of muscle spindles originated from the limb bud mesenchyme. These experiments suggest that the connective tissue sheaths of peripheral nerves (at least in the limb region of avian embryos) are not of neural crest origin, but are formed from limb bud mesenchyme.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00305043
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  • 2
    Electronic Resource
    Electronic Resource
    Undulating course of nerve fibres and bands of Fontana in peripheral nerves of the rat (1986)
    Springer
    Anatomy and embryology 174 (1986), S. 407-411 
    Details
    ISSN: 1432-0568
    Keywords: Undulating course of nerve fibre ; Endoneural collagen ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The undulating course of nerve fibres and the optical effect of that course, i.e. the bands of Fontana, were studied in the peripheral nerves of the adult rat using light microscopy. The arrangement of collagen fibres in the endoneurium of these nerves was evaluated using transmission and scanning electron microscopy. No nerve fibres undulation was noted on the intracranial sections of the cranial nerves or on the spinal roots. In their endoneurium a few, irregularly arranged collagen fibrils were found. In contrast, the nerve fibres undulation and Fontana's bands were a constant feature in the peripheral course of the nerve trunks. They were discernible in vivo and on excised unfixed as well as fixed nerves. The nerve fibres follow a sine-curve course of variable frequence and amplitude. Exposed in vivo, the nerve fibres retained their wave-like course even after removal of the epineurium and perineurium. The endoneurium of these nerves contained numerous undulating longitudinally oriented bundles of collagen fibrils. These findings suggest that the undulating course of the nerve fibres in peripheral nerves is conditional upon the quantity and arrangement of their endoneurial collagen fibrils. When the nerve was stretched in the course of movement, the undulation became straightened out until it disappeared. Conversely, nerve shortening enhanced the undulation. Thus the wave-like alignment of the nerve fibres represents a physiological reserve length for nerve stretching.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00698791
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Tyrosinase Protein Is Expressed Also in Some Neural Crest Derived Cells Which Are Not Melanocytes (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Periodontology 2000 1 (1988), S. 0 
    Details
    ISSN: 1600-0757
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Some neural crest cells give rise to pigment cells in early ontogenesis. We tested here whether tyrosinase-a key enzyme in melanogenesis—was present in some nonpigment neural crest derivatives in adult hamsters.Interestingly enough, inactive tyrosinase protein was detected, using indirect immunofluorescence, in the satellite cells of spinal ganglia and Schwann cells of sciatic and facial nerves in normal adult animals. The results of cell blotting from spinal ganglia were similar to the fluorescence findings.Thus, our results seem to support the hypothesis that Schwann cells, satellite cells of spinal ganglia, and melanocytes may be more intimately related developmentally than other neural-crest-derived cells. Moreover, since we detected tyrosinase protein in cells which normally do not produce melanosomes, it could be deduced that, during the melanocyte's differentiation from its cell precursor, the expression of tyrosinase protein might precede the point when melanosomes begin to differentiate from known cytoplasmic structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0749.1988.tb00129.x
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    Paper (German National Licenses)
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