منابع مشابه
Ultrastructure of developing human muscle: the problem of multinucleation of striated muscle cells.
The authors studied by electron microscopy the muscle of 27 human foetuses ranging from 9 weeks to 9 months development. It was possible to observe that disintegration of the plasma membranes of adjacent myoblasts and myotubes which share a common basement membrane tube appears to occur in longitudinally disposed cells of those categories. This may help to explain how further nuclei may be inco...
متن کاملUltrastructure of heart muscle.
The ultrastructure of cardiac muscle is described. In the course of the descriptions advantage has been taken of comparative anatomy, in order to elucidate the relationships between structure and function. Physiologic parameters are discussed in a comparative manner including information from skeletal muscles fibers that often provide a well-studied point of departure. The descriptions of the u...
متن کاملUltrastructure of Somatic Muscle
Somatic muscle cells of Ascaris lumbricoides consist of three differently specialized components referred to as the fiber, which contains the contractile apparatus (described previously), the belly, and the arm. The belly is shown to be a sac of glycogen, which is depleted during starvation of the animal. The arm extends to a nerve cord where it establishes a myoneural junction characterized by...
متن کاملThe ultrastructure of developing sarcoplasmic reticulum.
Developmental changes in the sarcoplasmic reticulum and surface membranes of chicken skeletal muscles were investigated by electron microscopy. A dominant feature of freeze-etched sarcoplasmic reticulum membranes isolated from adult animals is the presence of spherical intramembranous particles of 75 A apparent diameter which are more numerous on the concave than on the convex cleaved faces. Th...
متن کاملMyosin subunit composition in human developing muscle.
Previous pyrophosphate-gel studies have reported the existence of embryonic neonatal myosin isoenzymes in human developing muscle. The present investigation was undertaken to characterize their subunit composition more precisely. Two immature muscle myosins are contrasted with adult myosin: neonatal myosin and foetal myosin. The neonatal form of myosin is weakly cross-reactive with rabbit slow ...
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ژورنال
عنوان ژورنال: Neonatology
سال: 1981
ISSN: 1661-7800,1661-7819
DOI: 10.1159/000241504