PMID: 6411023May 1, 1983Paper

Myocardium-cardiac jelly dissociation and conal torsion. A study on the chick embryo heart

Archives des maladies du coeur et des vaisseaux
X Dor, P Corone

Abstract

Conal twisting seems to result from dissociation between the cardiac jelly and the deep myocardial interface like the lining in the sleeve of a jacket. The conal ridges are the natural markers of the jelly and endocardium. They are responsible for septation of the conus and enable the twisting to be observed and measured. The myocardium is marked artificially by cauterisation. This marks the armature of the wall and leaves behind a zone of reduced resistance in the form of a hernia or false diverticulum. The conal ridges and marked myocardium dissociate. In the mid segment the myocardium does not play any role in twisting. In the proximal and distal segments it is only partially involved. This dissociation is observed even in the structure of the conal wall; the jelly, which is dense near the endocardium, is loose near the myocardium and adheres to the deep surface by dispersed fibres. Perfusion under pressure of the investigated specimens induces a detachment between the jelly and the myocardium and there only. This fragility only lasts during the twisting period. It is not found at the end of cardiac embryogenesis. This zone would allow not only a sliding--due to its fragility--but also a controlled sliding--by its fibres. In...Continue Reading

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