Histochemical study, morphometric analysis and systematic distribution of fiber types in the rectus femoris muscle of the albino rats
Vega-Alvarez, J.A.; Pena, C.; Bengoechea, M.P.; Perez-Casas, A.
Bulletin de l'Association des Anatomistes 73(221): 29-33
1989
ISSN/ISBN: 0376-6160 PMID: 2804385 Document Number: 344340
The histochemical and morphometric characteristics as well as the systematic distribution of fiber types in the muscle rectus femoris (RF) of adult male rats were studied from ATPase (pre-incubated at pH 9'4, 4'6 and 4'2) and NADH stained sections. The muscle fiber types were classified as I type, IIA type and IIB-type. In 20 RF muscles 90-95% of total fibers were sampled and the mean diameter, length and irregularity-degree analysed. The data were grouped in four quadrants and the percent of fiber types was determined. The type IIB fibers predominate in all quadrants. The largest fibers were the IIB type and the smallest ones the type I, for all the quadrants. Our findings support a functional compartmentalization as proposed by many authors.