ISSN:
1432-0878
Keywords:
Cardiac sarcomeres
;
Tmetonyx cicada (Crustacea)
;
T-tubules
;
Sarcoplasmic reticulum
;
Couplings
;
Electron microscopy
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Medicine
Notes:
Summary The membrane systems of the cardiac muscle cell of the amphipod Tmetonyx cicada (O. Fabricius) are described. The sarcolemma invaginates and forms a transverse network of tubules at the level of the Z band. Narrow longitudinal tubules branch from the network and connect to another transverse network of tubules at the H band level, where dyadic and triadic junctions are formed with the sarcoplasmic reticulum. Adjacent myofibrils are normally separated by a well developed double layer of the sarcoplasmic reticulum. In areas where the myofibrils closely approach the outer sarcolemma, peripheral couplings have been found at the level of the H band.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00224307
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