ISSN:
1432-0878
Keywords:
Muscle fiber types
;
Atlantic hagfish (Myxine glutinosa, L.)
;
Myosatellite cells
;
Intranuclear rodlets
;
Electron microscopy
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Medicine
Notes:
Summary Four types of striated muscle fibers with distinctive ultrastructure were defined in the Atlantic hagfish (Myxine glutinosa, L.): “white”, “intermediate”, and “red” fibers of m. parietalis, and “red” fibers of m. craniovelaris. “White” fibers are thick, contain very few mitochondria and fat vacuoles, and possess distinct and separate myofibrils with thin Z-disks and distinct M-lines. “Intermediate” fibers are thinner, possess largely similar myofibrils that often are even better separated due to a higher content of fat vacuoles and especially mitochondria and glycogen granules. “Red” fibers of m. parietalis contain large amounts of mitochondria, fat vacuoles, and glycogen granules. Their myofibrils possess M-lines, and although branching more, the myofibrils of “red” fibers conform with a “Fibrillenstruktur” pattern like those of “white” and “intermediate” fibers. “Red” fibers of m. craniovelaris are very thin, possess many smaller fat vacuoles, and large amounts of mitochondria and glycogen granules. The myofibrils are significantly thinner than in m. parietalis fibers, run as quite independent well separated units, possess thicker Z-disks, and lack M-lines. Large amounts of myosatellite cells are associated with these “red” fibers. Triads are located near A/I-junctions in all four fiber types and occur irregularly, the density of triads being different in the various fiber types.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00307482
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