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Journal of Experimental Biology, Vol 201, Issue 6 779-791, Copyright © 1998 by Company of Biologists

JOURNAL ARTICLES

Changes in the ultrastructure of surviving distal segments of severed axons of the rock lobster

I Parnas, O Shahrabany-Baranes, N Feinstein, P Grant, H Adelsberger and J Dudel
Otto Loewi Minerva Center for Cellular and Molecular Neurobiology, Hebrew University of Jerusalem, Israel.

Peripheral axons of lobsters can survive for many months after axotomy. We have investigated the structural and ultrastructural changes seen after axotomy using confocal microscopy and electron microscopy. While the proximal stump had a normal appearance, the distal part of the cut axon became lobulated, and glial cells penetrated the original glial tube (axon tube) in which the axon normally runs. The changes proceeded from the cut end towards the muscle. As time elapsed, the axon tube seemed to be filled with glial cells, but interposed small profiles of the original axon could be identified by injection of a fluorescent dye into the axon. The glial cells send cytoplasmic projections deep into folds of the axolemma, and nuclei were found at the end of these long processes. Proliferation of glial cells was also seen.


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© The Company of Biologists Ltd 1998