LIGHT MICROSCOPIC IDENTIFICATION OF IMMATURE GLIAL CELLS IN SEMITHIN SECTIONS OF DEVELOPING MOUSE CORPUS-CALLOSUM

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  • 1 January 1976
    • journal article
    • research article
    • Vol. 122  (DEC) , 521-537
Abstract
Criteria for identification of immature glia in semithin, light microscopic sections were established. Four distinct types of glial cell were recognized in the corpus callosum of young postnatal mice: the early glioblast the small globast, the large glioblast and the young astrocyte. Mature microglia could be recognized from birth. In semithin, toluidine blue stained sections early glioblasts had large, fair to moderately stained nuclei, and a thin rim of pale cytoplasm; small glioblasts had small, dark nuclei and a rim of darkly stained cytoplasm; large glioblasts had moderately unevenly stained nuclei and a thin rim of moderately stained cytoplasm; and young astrocytes had fairly small nuclei, moderately stained cytoplasm, and one or more processes, which could usually be seen extending for 5 .mu.m or more from the perikaryon. Differential glial counts using the criteria described above, in conjunction with EM analysis, suggested that early glioblasts gave rise to small glioblasts and large glioblasts; that small glioblasts gave rise directly to astrocytes, large glioblasts, oligodendrocytes and possibly microglia; that large glioblasts formed oligodendrocytes only, and might be immature light oligodendrocyts; and that part of the microglial population might arise from vascular pericytes.

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