The location of spinothalamic axons within spinal cord white matter in cat and squirrel monkey

Richard T. Stevens*, A. Vania Apkarian, Charles J. Hodge

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

The locations of spinothalamic (STT) fibers in the spinal cord white matter have been identified in cat and squirrel monkey by light-microscopic visualization of labeled fibers following multiple thalamic injections of wheatgerm agglutinin conjugated to horseradish peroxidase. Thalamic injections were combined with either a constricting dural tie or an intraspinal injection of colchicine to facilitate axonal labeling at more rostral spinal levels. In the cat, the ventral-to-dorsal distribution of labeled STT fibers was bimodal. In the ventrolateral white matter, labeled axons were coarse in nature and were primarily concentrated peripherally. In the dorsolateral white matter, labeled STT axons consisted of fine-caliber fibers concentrated in the ventral portion of the dorsolateral funiculus and were equally distributed throughout the medial and lateral white matter. In the squirrel monkey, the distribution of STT fibers was unimodal, extending from the ventral surface of the spinal white matter to the ventralmost portion of the dorsolateral funiculus. As in the cat, however, the ventrally located axons were large and coarse and were primarily located in the peripheral white matter, whereas the dorsalmost STT fibers were of fine caliber and were distributed equally in the medial and lateral white matter.

Original languageEnglish (US)
Pages (from-to)97-102
Number of pages6
JournalSomatosensory & Motor Research
Volume8
Issue number2
DOIs
StatePublished - Jan 1 1991

Keywords

  • Ascending projections
  • Dorsolateral funiculus
  • Lamina I
  • Pain

ASJC Scopus subject areas

  • Physiology
  • Sensory Systems

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