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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Colflesh, D. E. Dewey, M. M. Levine, R. J. |
| Abstract | The musculature of the telson of Limulus polyphemus L. consists of three dorsal muscles: the medial and lateral telson levators and the telson abductor, and one large ventral muscle; the telson depressor, which has three major divisions: the dorsal, medioventral, and lateroventral heads. The telson muscles are composed of one type of striated muscle fiber, which has irregularly shaped myofibrils. The sarcomeres are long, with discrete A and I and discontinuous Z bands. M lines are not present. H zones can be identified easily, only in thick (1.0 µm) longitudinal sections or thin cross sections. In lengthened fibers, the Z bands are irregular and the A bands appear very long due to misalignment of constituent thick filaments. As the sarcomeres shorten, the Z lines straighten somewhat and the thick filaments become more aligned within the A band, leading to apparent decrease in A band length. Further A band shortening, seen at sarcomere lengths below 7.4 µm may be a function of conformational changes of the thick filaments, possibly brought about by alterations in the ordering of their paramyosin cores. |
| ISSN | 00219525 |
| e-ISSN | 15408140 |
| Journal | The Journal of Cell Biology |
| Issue Number | 3 |
| Volume Number | 58 |
| Language | English |
| Publisher | Rockefeller University Press (United States) |
| Publisher Date | 1973-09-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Brachyura Anatomy & Histology Muscles Cytology Myofibrils Animals Microscopy, Electron Muscle Proteins Protein Conformation Cell Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Medicine |
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