HISTOLOGY OF THE RETRACTOR MUSCLES OF PHASCOLOSOMA GOULDII POURTALÈS
Open Access
- 1 February 1940
- journal article
- research article
- Published by University of Chicago Press in The Biological Bulletin
- Vol. 78 (1) , 24-28
- https://doi.org/10.2307/1537796
Abstract
The retractor muscles of Phascolosoma consist of densely packed spindle-shaped fibers which have an average length of 1 mm. and an average diameter of 6 or 7 micra. The fibers are uninucleate, the nuclei usually occupying an eccentric position midway between the fiber terminals. Fine fibrils are densely and uniformly distributed throughout the fibers. They are essentially straight parallel structures. Vertical alignment of the contraction nodes of adjacent fibers in isometrically contracted muscle produces cross-striations simulating the Q and J discs of skeletal muscle.This publication has 3 references indexed in Scilit:
- A comparative study of the discs of cross‐striated muscle and simulacra in smooth muscle, with special reference to so‐called transitional musculatureJournal of Anatomy, 1938
- The force exerted by dogfish and Phascolosoma muscles at different velocities of shorteningJournal of Cellular and Comparative Physiology, 1938
- THE HISTOLOGY OF THE RETRACTOR MUSCLES OF THYONE BRIAREUS LESUEURThe Biological Bulletin, 1938