Publication: First ultrastructural differentiation of myoblasts of chicken embryos: appearance of the initial filaments
Authors
González Santander, R. ; Martínez Cuadrado, G. ; Martínez Alonso, F.J. ; Toledo Lobo, M.V.
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Publisher
Murcia : F. Hernández
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DOI
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info:eu-repo/semantics/article
Description
Abstract
A study is made of the structure and
ultrastructure of myoblasts located in the myotome in
chicken embryos, between stages 18 and 19, for electron
microscope observation of the occurrence of the first
myogenetic filamentous molecules. We suggest a
hypothesis for the formation of initial filaments
consisting of an initial synthesis of actin globular
molecules, carried out in the centre of the myoblast, near
the nucleus, with the participation of RNA and the
ribosomes. These molecules accumulate peripherically
in areas below the plasmatic membrane where they
polymerize into actin filamentous molecules which form
the initial filaments. These move towards the sharp ends
of the myoblast, under the plasmatic membrane, and
thence to the interior of the cytoplasm, where they are
evenly distributed. This genesis of initial filaments is
independent of the influence of the nervous system. We
postulate the existence of a single type of myoblast, of
fibrillar form, with a dark central area containing the
nucleus and the cell organelles, and two sharp, light end
zones which contain only the initial filaments in a very
light cytoplasmic matrix.
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