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  • 1980-1984  (2)
  • Optic nerve  (1)
  • Optic systems  (1)
  • Ultrastructure  (1)
  • Electron microscopy
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  • 1
    Electronic Resource
    Electronic Resource
    Pattern of structural differentiation in the optic nerve of trout (Salmo gairdneri) (1982)
    Springer
    Development genes and evolution 191 (1982), S. 176-184 
    Details
    ISSN: 1432-041X
    Keywords: Trout ; Optic nerve ; Myelination ; Glial cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The development of the trout optic nerve is quantitatively described from early ontogenesis into adulthood. The nerve is oval in cross section until stage 34, thereafter the formation of vertically aligned parallel folds can be observed and thus the unique shape of a folded ribbon is gradually attained. Quantitative measurements revealed a linear increase in cross sectional area, caused in part by the formation of new folds and in part by an increase in size of the preexisting ones. We attribute the continuous expansion of individual folds to an increase in fiber size subsequent to myelination rather than to the addition of new fibers. The total number of glial cells increased concomitantly per fold. Myelinogenesis starst at stage 33 with the ensheathement of axons beginning at the dorsal edge of the primary fold and follows a highly ordered pattern throughout development, strictly succeeding neural outgrowth. The functional significance of this pattern is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00848333
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Ingrowth of optic nerve fibers and onset of myelin ensheathment in the optic tectum of the trout (Salmo gairdneri) (1982)
    Springer
    Cell & tissue research 227 (1982), S. 201-211 
    Details
    ISSN: 1432-0878
    Keywords: Optic systems ; Axonal growth ; Myelination ; Ultrastructure ; Teleosts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The early differentiation of the optic pathway of the trout was studied by means of autoradiography, silver impregnation and electron microscopy. Ingrowth of optic nerve fibers into the optic tectum was consistently shown by tracer application and Golgi studies to occur at stage 28, about one week before hatching. Fibers being arranged in discrete bundles were rapidly growing through the longitudinal axis of tectum and at stage 33 reached its posterior end. Cross sections of these fiber bundles at different positions revealed myelin ensheatment to be initiated at the end of stage 34 at the anterior pole of the tectum. Since in the optic nerve of the trout the onset of myelination occurred even earlier (stage 33), it is assumed that this differentiation process follows a rostro-caudal gradient during development of the optic pathway.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00206341
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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