Axonal branching in the periaqueductal gray projections to the thalamus: a fluorescent retrograde double-labeling study in the cat

Paolo Barbaresi, Florenzo Conti, Tullio Manzoni

Research output: Contribution to journalArticle

Abstract

The double-labeling technique based on the retrograde axonal transport of fluorescent tracers (Evans blue, EB; Fast blue, FB; Nuclear yellow, NY) was used in the cat in order to investigate the occurence of axonal branching in the periaqueductal gray (PAG) projections to some thalamic nuclei (n. ventralis postero-lateralis, VPL; n. ventralis postero-medialis, VPM; n. parafascicularis, Pf). In a first group of cats, FB and EB were injected, respectively, within the right and left VPM. In another two groups of cats, FB injections into Pf were combined with either EB or NY injections within VPL or VPM. Double-labeled neurons were found within the PAG only in the animals of the first group. The present results show that some PAG neurons project bilaterally to VPM by means of axons collaterals.

Original languageEnglish
Pages (from-to)137-141
Number of pages5
JournalBrain Research
Volume252
Issue number1
DOIs
Publication statusPublished - Dec 2 1982

Keywords

  • double-labeling
  • fluorescent tracers
  • periaqueductal gray matter
  • thalamic nucleus parafascicularis
  • thalamic ventrobasal complex

ASJC Scopus subject areas

  • Developmental Biology
  • Molecular Biology
  • Clinical Neurology
  • Neuroscience(all)

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