Studies on the fine structural localization of zinc-iodide-osmium reaction in the brain. II. Some characteristics of localization in certain identified synapses

Norbert Hálasz, Ferenc Joó, Árpád Párducz

Research output: Article

4 Citations (Scopus)


Samples of the olfactory bulb and cerebellar cortex from rats were impregnated in zinc-iodide-osmium (ZIO) solution. The fine structural localization of ZIO impregnation product was studied and, in addition, the percentage distribution of ZIO-positive synaptic vesicles was ascertained in certain synapses of known function. Spherical vesicles, particularly in aldehyde-prefixed material, were found to be more resistant to ZIO impregnation than ovoid vesicles, both in dendro-dendritic and in axodendritic synapses. The different ZIO reactivity of synaptic vesicles in excitatory and inhibitory synapses, apart from reflecting an important difference in the chemical composition of synaptic vesicles, may offer a new method for characterizing synapses in relation to certain functions.

Original languageEnglish
Pages (from-to)557-566
Number of pages10
JournalJournal of Neurocytology
Issue number5
Publication statusPublished - nov. 1 1974


ASJC Scopus subject areas

  • Anatomy
  • Neuroscience(all)
  • Histology
  • Cell Biology

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