[Classification of muscle cells].
Muscle cells, including smooth muscle cells, cardiac muscle fibers and skeletal muscle fibers, are specialized for generation of movement and force in a specific direction. Smooth muscle cells are mononucleate cells, isolated or grouped in layers in various tissues, or rarely forming individualized muscles. Smooth muscle cell contraction is slow and depends on the autonomic nervous system. Cardiac muscle cells are mononucleate striated cells, with fast, rhythmic, spontaneous contractions. Skeletal muscle fibers are multinucleate cells at the origin of voluntary movements. According to morphological and functional criteria, skeletal muscle fibers are classified as type I fibers (slow-twitch oxidative), type IIA fibers (fast-twitch oxidative glycolytic) or type IIB fibers (fast-twitch glycolytic).
Authier
F J
FJ
Département de Pathologie, Hôpital Henri Mondor, Créteil.
D002965:Classification; D006801:Humans; D009119:Muscle Contraction; D018485:Muscle Fibers, Skeletal; D018482:Muscle, Skeletal / Q000166:cytology / Q000502:physiology; D009130:Muscle, Smooth / Q000166:cytology; D009132:Muscles / Q000166:cytology*; D009206:Myocardium / Q000166:cytology