Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

Extraocular Muscles in the Lamprey, Lampetra fluviatilis L.

Extraocular Muscles in the Lamprey, Lampetra fluviatilis L. Six extraocular muscles of the river lamprey, Lαmpetrα fluviαtilis L., were studied with the light and electron microscope. On the basis of morphology and histochemistry three types of muscle fibres were distinguished: thin, thick mitochondria-rich and thick multifibrillar fibres. In the thin fibres, 2.8–22.4 μm in diameter, myofibrils are distributed peripherally and show strong ATPase activity. The mitochondria are located paraxially. In the thick mitochondria-rich fibres, 19.4–31.0 μm in diameter, myofibrils are also located peripherally, whereas the central part of the fibre is densely packed with very numerous mitochondria possessing tubular cristae. Thick multifibrillar fibres, with a diameter similar to that of the former type, contain thin myofibrils scattered over the entire cross-section of the fibre. The activity of myofibrillar ATPase is lower in both types of thick fibres than in the thin ones. The tubules of the T system were observed frequently only in the thick multifibrillar fibres. The extraocular muscles of the lamprey are composed of large quantities of muscle fibres. Thin and thick fibres do not form separate layers, but are more or less uniformly distributed throughout the muscle. Many muscle fibres show structural features suggesting their degeneration. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Cells Tissues Organs Karger

Extraocular Muscles in the Lamprey, Lampetra fluviatilis L.

Witaliński, Wojciech; Łabuda, Halina
Cells Tissues Organs , Volume 114 (2): 12 – Jan 1, 1982
Download PDF
12 pages

Loading next page...
 
/lp/karger/extraocular-muscles-in-the-lamprey-lampetra-fluviatilis-l-0hkDLmez7I

References

References for this paper are not available at this time. We will be adding them shortly, thank you for your patience.

Publisher
Karger
Copyright
© 1982 S. Karger AG, Basel
ISSN
1422-6405
eISSN
1422-6421
DOI
10.1159/000145588
Publisher site
See Article on Publisher Site

Abstract

Six extraocular muscles of the river lamprey, Lαmpetrα fluviαtilis L., were studied with the light and electron microscope. On the basis of morphology and histochemistry three types of muscle fibres were distinguished: thin, thick mitochondria-rich and thick multifibrillar fibres. In the thin fibres, 2.8–22.4 μm in diameter, myofibrils are distributed peripherally and show strong ATPase activity. The mitochondria are located paraxially. In the thick mitochondria-rich fibres, 19.4–31.0 μm in diameter, myofibrils are also located peripherally, whereas the central part of the fibre is densely packed with very numerous mitochondria possessing tubular cristae. Thick multifibrillar fibres, with a diameter similar to that of the former type, contain thin myofibrils scattered over the entire cross-section of the fibre. The activity of myofibrillar ATPase is lower in both types of thick fibres than in the thin ones. The tubules of the T system were observed frequently only in the thick multifibrillar fibres. The extraocular muscles of the lamprey are composed of large quantities of muscle fibres. Thin and thick fibres do not form separate layers, but are more or less uniformly distributed throughout the muscle. Many muscle fibres show structural features suggesting their degeneration.

Journal

Cells Tissues Organs – Karger

Published: Jan 1, 1982

Keywords: Extraocular muscles; Lamprey; Histochemistry; Ultrastructure

There are no references for this article.