Author/Editor		Pernuš, F; Eržen, I
Title		Arrangement of fiber types within fascicles of human vastus lateralis muscle
Type		članek
Source		Muscle Nerve
Vol. and No.		Letnik 14, št. 4
Publication year		1991
Volume		str. 304-9
Language		eng
Abstract		A total of 106 fascicles at 6 predetermined areas of the vastus lateralis muscle from 9 healthy men, aged 18 to 40 years, were analyzed. Fibers in a fascicle were divided into layers according to their relation to the perimysium. In each layer the proportions of type 1 and 2, subdivided into 2a, 2b, and 2c fibers were determined and normalized by the fiber type proportion in the whole fascicle. A consistent arrangement of fiber types within the fascicles was obtained, regardless of subject, sampling site, fiber type proportion, and fascicle size. A high proportion of 2b fibers on the border, a prevalence of type 1 fibers in the layer beneath, and a rather uniform distribution of 2a fibers in all layers are the main characteristics of the distribution of fibers in a fascicle. Developmental processes in fiber type differentiation most probably constitute the basis for fiber type arrangement, which can further be influenced by local factors.
Descriptors		MUSCLES ADENOSINETRIPHOSPHATASE ADULT MUSCLES THIGH