Light microscopy of developing skeletal muscle fibres in the fetus. Skeletal muscle forms from dozens up to thousands of precursor cell end-to-end fusions resulting in multiple cell nuclei along the growing muscle fibres. Fibres appear irregularly hollow forming myotubes. With further synthesis of contractile filaments in the cell cytoplasm and growth in fibre width the nuclei are displaced to the edge of the fibres typical of the structure of adult skeletal muscle. Faint striations represent formation of the contractile units of future sarcomeres. Magnification x400 when narrow width printed at 10 cm.
July 28th, 2016
Viewed 16 Times - Last Visitor from Beverly Hills, CA on 06/09/2019 at 12:25 PM