The CNS from 30 normal fetuses aged 5-28 weeks were studied in GFAP stained paraffin-embedded material. The technique of preparation, autopsy and fixation is described in details. GFAP reacting glial cells developed first in the spinal cord at 7 weeks, and appeared in all regions of CNS during fetal life in a systematic way but with a temporal variation. The supporting and guiding properties of the fibrillary astrocytes are stressed.
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