Chesapeake Science

, Volume 18, Issue 2, pp 197–207 | Cite as

Fine structure of the myocardium of the blue crabCallinectes sapidus rathbun

  • William E. Hawkins
  • Harold D. Howse
  • Victor J. Ferrans


The myocardium of the blue crabCallinestes sapidus has the following ultrastructural features. Myocardial cells are transversely striated with A, I, and Z-bands, H-zones, and M-lines. Thick myofilaments are arranged in a hexagonal pattern and each thick myofilament is surrounded by six thin myofilaments. The sacrotubular system consist of the sacroplasmic reticulum, transverse tubules, and longitudinal tubules. Intercalated discs having gaps 40–600 Å wide connect adjacent muscle cells end-to-end. Interstitial cells are often observed beneath the external laminae of the myocardial cells. Nerve terminals and glial elements are also embedded in the myocardial cells. The nerve terminals contain both dense and clear vesicles. The dense vesicles are round (800–1000 Å in diameter), whereas clear vesicles are either round (360–600 Å in diameter) or flattened (350×700 Å). *** DIRECT SUPPORT *** A00BY066 00004


Sarcoplasmic Reticulum Interstitial Cell Myocardial Cell Thick Filament Intercalate Disc 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Estuarine Research Federation 1977

Authors and Affiliations

  • William E. Hawkins
    • 1
  • Harold D. Howse
    • 1
  • Victor J. Ferrans
    • 2
  1. 1.Section of MicroscopyGulf Coast Research LaboratoryOcean Springs
  2. 2.Section of Pathology National Heart and Lung InstituteNational Institutes of HealthBethesda

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