ISSN:
1432-0878
Keywords:
Axon sprouts
;
Regeneration
;
Dorsal column lesion
;
Electron microscopy
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Medicine
Notes:
Summary A graded series of changes occur around lesions to the central nervous system. In the present investigation three zones were distinguished caudal to a lesion of the dorsal columns in the rat, In Zone I near the lesion, necrosis and cellular disintegration are followed by phagocytosis, and the development of a loose connective tissue matrix. Here Schwann cells proliferate and envelope axon sprouts in a similar fashion to those in developing of regenerating peripheral nerve. Zone II includes the proximal segment of nervous tissue containing normal appearing axons in continuity with parent nerve cells. Here an initially severe edematous condition is followed by growth and proliferation of astrocytes. Axon sprouts are present in the transitional Boundary Zone the first day following a lesion. They continue to grow and are most numerous at one week. By two weeks axons have apparently disappeared from many parts of Zone I and degeneration of parent axons and retraction clubs is advanced in Zone II. The reasons for axon involution are not known but do not appear to be related to the development of a glial scar.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00209047
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