Postnatal loss of axons in normal rat sciatic nerve

C. B. Jenq, K. Chung, R. E. Coggeshall

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32 Citations (Scopus)

Abstract

Myelinated and unmyelinated axons were counted in sciatic nerves of newborn, 5-day-old, and adult rats. Myelinated axons increase from essentially none at birth to approximately 8,000 in adulthood, but total axon numbers decrease steadily from 33,954 at birth to 22,872 in adulthood. Thus there is a significant postnatal loss of axons from rat sciatic nerve. This loss is, in our opinion, not associated with the death of the cells that give rise to these axons. This is thus an example of a regressive event that probably is of importance in normal neural development, namely the postnatal elimination of axons unaccompanied by death of the neurons that give rise to axons. These findings presumably imply a considerable amount of proximal peripheral axon branching, and the postnatal elimination of axons in the sciatic nerve presumably results from a reduction of this branching. Thus postnatal elimination of processes on, for example, somatic muscle cells may be at least partially the result of long axon elimination rather than local withdrawal of presynaptic processes, as is usually thought to be the case. In addition, an increased number of axons resulting from early postnatal manipulations may indicate cessation of axon loss rather than formation of new axons.

Original languageEnglish (US)
Pages (from-to)445-450
Number of pages6
JournalJournal of Comparative Neurology
Volume244
Issue number4
StatePublished - 1986

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Sciatic Nerve
Axons
Parturition
Muscle Cells
Cell Death

ASJC Scopus subject areas

  • Neuroscience(all)

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Jenq, C. B., Chung, K., & Coggeshall, R. E. (1986). Postnatal loss of axons in normal rat sciatic nerve. Journal of Comparative Neurology, 244(4), 445-450.

Postnatal loss of axons in normal rat sciatic nerve. / Jenq, C. B.; Chung, K.; Coggeshall, R. E.

In: Journal of Comparative Neurology, Vol. 244, No. 4, 1986, p. 445-450.

Research output: Contribution to journalArticle

Jenq, CB, Chung, K & Coggeshall, RE 1986, 'Postnatal loss of axons in normal rat sciatic nerve', Journal of Comparative Neurology, vol. 244, no. 4, pp. 445-450.
Jenq CB, Chung K, Coggeshall RE. Postnatal loss of axons in normal rat sciatic nerve. Journal of Comparative Neurology. 1986;244(4):445-450.
Jenq, C. B. ; Chung, K. ; Coggeshall, R. E. / Postnatal loss of axons in normal rat sciatic nerve. In: Journal of Comparative Neurology. 1986 ; Vol. 244, No. 4. pp. 445-450.
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