using 1.0 micron semi-thin sections and a particle size analyser ( tga 10 , zeiss ) it was found that both myelin sheaths and their associated axons grew in diameter until about 400 days of age , but massive destruction and disappearance of myelinated nerve fibres became manifest only after 700 days of age .
C0026973
myelin sheaths
C0027750
myelinated nerve fibres