Biol. Bull. Sign up for etocs!
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Biol Bull 78: 24-28. (February 1940)
© 1940 Marine Biological Laboratory
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by OLSON, M.
Right arrow Search for Related Content
PubMed
Right arrow Articles by OLSON, M.

HISTOLOGY OF THE RETRACTOR MUSCLES OF PHASCOLOSOMA GOULDII POURTALÈS

MAGNUS OLSON 1

1 From the Marine Biological Laboratory, Woods Hole, and the Department of Zoölogy, University of Minnesota

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.






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1940 by the Marine Biological Laboratory.