Abstract
A differential staining method of myelinated fibers and nerve cell bodies applicable to whole blocks of mammalian central nervous tissue is described. Experimental material fixed by perfusion or necropsy material fixed in block can be used. Blocks of 2 mm in thickness were obtained with a vibratome, immersed in 50% ethanol for 7 h and stained for 1 week in the following solution: 0.3% thionine, 5% formaldehyde and 5% acetic acid. After the staining period the blocks were washed in distilled water, dehydrated through graded alcohols, cleared in butyl acetate and infiltrated in paraffin. Sections of 10 μm in thickness were obtained, attached to slides, dewaxed in xylene and coverslipped with mounting media in the usual manner.
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