Article
Article
Muscular system disorders
Article By:
Sumi, S. Mark School of Medicine, University of Washington, Seattle, Washington.
Last updated:2014
DOI:https://doi.org/10.1036/1097-8542.440300
Disorders affecting skeletal (voluntary) muscle. Every skeletal muscle consists of a large number of muscle fibers, each of which is a multinucleated cell containing the usual types of cellular inclusions, but also containing the myofibrils, which are the actual contractile elements. The myofibrils have a banded structure which gives the muscle fiber its characteristic striated appearance on histologic examination. Muscle fibers have been separated into two main groups based on their histochemical reaction: type 1 fibers, which are rich in mitochondria and oxidative activity, and type 2 fibers. See also: Muscle
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