Synaptic connections of a low-threshold mechanoreceptive primary neuron within the trigeminal subnucleus oralis

Tomosada Sugimoto, Yoshitaka Nagase, Takahiko Nishiguchi, Seiichiro Kitamura, Yoshio Shigenaga

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The central axon of a primary afferent neuron that responded to indentation of the glabrous skin of the lower lip in a slowly adapting fashion was intra-axonally injected with horseradish peroxidase. The labeled terminal within the subnucleus oralis was examined electron microscopically. The labeled ending had a pale axoplasm and contained clear spherical synaptic vesicles. The labeled ending formed a synaptic triad with a dendrite and an unlabeled axonal ending with pleomorphic vesicles (a mixture of oval, flattened and dense core vesicles). The labeled primary ending was presynaptic only to the dendrite, while the unlabeled ending was presynaptic to both the dendrite and the labeled primary ending.

Original languageEnglish
Pages (from-to)338-342
Number of pages5
JournalBrain Research
Issue number1-2
Publication statusPublished - May 10 1991



  • Primary neuron
  • Subnucleus oralis
  • Trigeminal nerve
  • Ultrastructure

ASJC Scopus subject areas

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

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