A telencephalospinal projection in the Tegu lizard (Tupinambis teguixin)

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9 Scopus citations

Abstract

Tegu lizards (Tupinambis teguixin) were studied to determine the presence of a homologue of the mammalian corticospinal tract. The sources of telencephalic efferent projections to the spinal cord were determined by evaluating the localization of retrogradely transported horseradish peroxidase applied in the cervical spinal cord. Labeled cells were present in subtelencephalic sites reported previously by other authors and, in addition, were found in the principal sensory and motor nuclei of the trigeminal nerve and in the nucleus of the posterior commissure. A telencephalospinal projection was identified, originating in the ventral caudal telencephalon. Histochemical staining revealed a high concentration of acetylcholinesterase in cells and neuropil in the same area. This tract is suggested to be homologous to the mammalian amygdalospinal tract. No reptilian homologue of the corticospinal tract was identified.

Original languageEnglish (US)
Pages (from-to)89-97
Number of pages9
JournalBrain Research
Volume496
Issue number1-2
DOIs
StatePublished - Sep 4 1989

Keywords

  • Amygdalospinal tract
  • Corticospinal tract
  • Efferent pathway
  • Horseradish peroxidase
  • Reptile

ASJC Scopus subject areas

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

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