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. 1969 Aug 1;42(2):534–547. doi: 10.1083/jcb.42.2.534

SARCOPLASMIC RETICULUM OF AN UNUSUALLY FAST-ACTING CRUSTACEAN MUSCLE

Jack Rosenbluth 1
PMCID: PMC2107662  PMID: 5792338

Abstract

The fast-acting, synchronous "remotor" muscle of the lobster second antenna was examined by light and electron microscopy and was found to have a more profuse sarcoplasmic reticulum (SR) than any other muscle known. Myofibrils are widely separated from one another and occupy only about one-fourth of the volume of the muscle; most of the remaining volume is taken up by the SR, which resembles the smooth-surfaced reticulum of steroid-secreting cells. Dense granules (0.03–0.1 µ in diameter) are scattered through the reticulum. T-tubules penetrate into the fibers and form dyads along the A bands of myofibrils; however, ferritin-labeling experiments show that the volume of the T-system is very small compared with that of the SR. Myofibrils are ∼0.5 µ x 1.0 µ in cross section and consist of thick filaments, which appear tubular except at the M region, and thin filaments, which are situated midway between neighboring thick filaments. The ratio of thin to thick filaments is 3:1. The extreme development of the SR in this muscle is discussed in relation to the exceedingly short duration of the contraction-relaxation cycle.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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