Freeze fracture of skeletal muscle from the Tarantula spider. Structural differentiations of sarcoplasmic reticulum and transverse tubular system membranes.

The Journal of cell biology ·Vol. 61 ·No. 2 ·1974-05-00 ·Pages 501-13

Franzini-Armstron C

Abstract

The structure of the membranes of sarcoplasmic reticulum (SR), tubular (T) system, and sarcolemma has been studied by freeze fracture in leg muscles of the Tarantula spider. Two regions of the sarcoplasmic reticulum can be differentiated by the distribution of particles on the fracture faces: a junctional SR, at the dyads, and a longitudinal SR, elsewhere. The dyads are asymmetric junctions, the disposition of particles in the apposed membranes of SR and T tubules being different from one another and from the regular arrangement of feet in the junctional gap. It is concluded that no channels can be visualized to directly connect SR- and T-system lumina.

MeSH Terms

Animals Extremities Freeze Etching Microscopy, Electron Models, Structural Muscles/cytology Sarcolemma Sarcoplasmic Reticulum Spiders/cytology

Authors & Affiliations

1 authors, click to expand affiliations / ORCID

Franzini-Armstron C

References (34)

34 references, click to expand

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Article Info

Journal

The Journal of cell biology

Abbr.

J Cell Biol

ISSN

0021-9525

DOI

10.1083/jcb.61.2.501

Published

1974-05-00

Pages

501-13

Language

English

Region

United States

NLM ID

0375356

PMCID

PMC2109291

Subset

External Links

PubMed source DOI: 10.1083/jcb.61.2.501 PMC Full Text View journal details

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Freeze fracture of skeletal muscle from the Tarantula spider. Structural differentiations of sarcoplasmic reticulum and transverse tubular system membranes.

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