Dynamics of structural changes in the dorsal roots of spinal nerves in growing dogs
Safonova, G.D.; Panasenko, S.V.
Morfologiia 139(2): 36-40
2011
ISSN/ISBN: 1026-3543 PMID: 21866804 Document Number: 652227
Dorsal roots of spinal nerves (S1 segment) were studied in 9 growing mongrel dogs aged 2, 5 and 10 months using morphologic and morphomertric the methods. Longitudinal paraffin sections, impregnated with silver nitrate, and semithin transverse sections, stained with methylene blue-basic fuchsin, were used. The general regularities of structural organization, as well as the patterns of nerve fiber arrangement in the studied age periods have been determined. In the process of growth, the thickening of the dorsal roots was found (which was most pronounced until 5 months together with the increase of the diameter and the changes in the proportions of small, medium and large myelinated nerve fibers, the decrease of their number per unit section area.