Spontaneous activity of ventral root axons following peripheral nerve injury

Kim Burchiel, L. C. Russell

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

In 18 Sprague-Dawley rats, the left sciatic nerve was divided at the mid-femur level. Seven to 9 days later, microfilament recordings were made from the ipsilateral L-5 ventral root. Spontaneous activity in the ventral root, ranging from 0.1 to 6.1 Hz, was recorded in 12 of the 18 animals. Conduction velocity determinations showed this activity to be in A-beta and A-delta fibers. Recordings in 10 normal L-5 ventral roots from five control rats showed no spontaneous activity. In the rats with sciatic nerve division, the ongoing discharge appeared to originate in the cut end of the nerve since mechanical stimulation of the neuroma produced synchronous ventral root activity. Furthermore, cooling of the neuroma inhibited the spontaneous discharge, whereas with rewarming it returned. Spontaneous ventral root activity was also increased by systemic application of epinephrine. This activity was qualitatively similar to spontaneous activity that has been recorded in dorsal root microfilaments after peripheral nerve injury. The observations of an ongoing discharge in potentially nociceptive ventral root axons subsequent to nerve injury may be relevant to the mechanism of chronic pain of peripheral origin.

Original languageEnglish (US)
Pages (from-to)408-413
Number of pages6
JournalJournal of Neurosurgery
Volume62
Issue number3
StatePublished - 1985
Externally publishedYes

Fingerprint

Peripheral Nerve Injuries
Spinal Nerve Roots
Axons
Neuroma
Sciatic Nerve
Actin Cytoskeleton
Rewarming
Chronic Pain
Femur
Epinephrine
Sprague Dawley Rats
Wounds and Injuries

ASJC Scopus subject areas

  • Clinical Neurology
  • Neuroscience(all)

Cite this

Spontaneous activity of ventral root axons following peripheral nerve injury. / Burchiel, Kim; Russell, L. C.

In: Journal of Neurosurgery, Vol. 62, No. 3, 1985, p. 408-413.

Research output: Contribution to journalArticle

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