Histological and morphometrical parameters of the skeletal muscle development in pigs
2009
Makovicky, Pe.,Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Veterinarnich Disciplin | Makovicky, Pa.,Slovenska Polnohospodarska Univ., Nitra (Slovak Republic). Katedra Specialnej Zootechniky | Levkut, Mi.,Univerzita Veterinarskeho Lekarstva, Kosice (Slovak Republic). Katedra Patologickej Anatomie, Patologickej Fyziologie a Genetiky | Levkut, Ma.,Univerzita Veterinarskeho Lekarstva, Kosice (Slovak Republic). Katedra Patologickej Anatomie, Patologickej Fyziologie a Genetiky | Vrtkova, I.,Mendelova Univ., Brno (Czech Republic). Ustav Morfologie, Fyziologie a Genetiky Zvirat
Samples of 21 and 42-day-old embryos and those from skeletal muscles of newborn and one-day-old piglets were used for the study of the parameters of the skeletal musculature development. The samples were collected from three muscles and processed for the light microscopy. Correlations between mean thickness of myoblasts, myotubes, mean thickness of muscular fibres and percentual area representation of muscular fibres and connective tissue were evaluated. During the early embryonic development promyoblasts arise via mitosis and differentiation of cells of the myotome. Then they differentiate to the postmitotic myoblasts. Close approximation of plasma membrane of neighbouring myoblasts initiates fusions and myotubes arise. Development of muscular fibres comes to an end shortly post partum. The development of new muscular fibres is limited by the number of myosateliocytes that persist among the population of muscular fibres. Subsequently, the growth of muscular fibres is carried out by hypertrophy. Fibres and cells of connective tissue are differentiated already in the embryonic stage. Fat droplets in myotubes and interstitial connective tissue are detectable already in the embryonic stage. Septation of skeletal muscles is practically finished post partum.
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