[Qualitative and quantitative characteristics of fibers of the gastrocnemius and pectoral muscles of the chicken embryo].
The electron microscopic study shows that in 10 days chick embryo parenchymal elements of the gastrocnemius and pectoralis muscles are myotubes with sparse mitochondria, and that they do not differ morphologically. Up to the 18th day in ovo muscle fibers in the future oxidative muscle grow up faster than those in the future glycolytic one. There is no relation between the mitochondrial density and distribution within sarcoplasm and the capillary location but they are in good correlation with the myofibrillar parameters. As muscle fibers mature the energy delivery of myofibrils (mitochondria-to-myofibrils volume density ratio) increases due to mitochondrial density rather than their size.
Korostyshevskaia
I M
IM
Laboratory of Microcirculation and Electron Microscopy, Institute of Physiology, Siberian Section of RAMS, Novosibirsk.
Maksimov
V F
VF
D000818:Animals; D002642:Chick Embryo; D008854:Microscopy, Electron; D018485:Muscle Fibers, Skeletal / Q000648:ultrastructure*; D018482:Muscle, Skeletal / Q000196:embryology / Q000648:ultrastructure*