Unmyelinated primary afferent fibers in dorsal funiculi of cat sacral spinal cord

K. Chung, R. E. Coggeshall

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

The present study tests the hypothesis that there are numerous unmyelinated primary afferent fibers in cat posterior funiculi. The animals have unilateral dorsal rhizotomies from L6 to Ca3. One week later the axons of both S2 dorsal funiculi are counted. The data indicate that there are approximately 22,500 myelinated and 8,500 unmyelinated axons on the unoperated side and 11,000 myelinated and 3,900 unmyelinated axons on the operated side. On this basis, we suggest that 51% of the myelinated and 54% of the unmyelinated axons in cat dorsal funiculi arise from dorsal root ganglion cells and thus are primary afferent axons. If this is correct, then 71% of the primary afferent axons in the cat dorsal funiculus are myelinated and 29% are unmyelinated. The function of this large group of previously unsuspected fine sensory axons remains to be determined.

Original languageEnglish (US)
Pages (from-to)365-369
Number of pages5
JournalJournal of Comparative Neurology
Volume238
Issue number3
StatePublished - 1985

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Axons
Spinal Cord
Cats
Rhizotomy
Spinal Ganglia

ASJC Scopus subject areas

  • Neuroscience(all)

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Unmyelinated primary afferent fibers in dorsal funiculi of cat sacral spinal cord. / Chung, K.; Coggeshall, R. E.

In: Journal of Comparative Neurology, Vol. 238, No. 3, 1985, p. 365-369.

Research output: Contribution to journalArticle

Chung, K. ; Coggeshall, R. E. / Unmyelinated primary afferent fibers in dorsal funiculi of cat sacral spinal cord. In: Journal of Comparative Neurology. 1985 ; Vol. 238, No. 3. pp. 365-369.
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