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Titolo:
ULTRASTRUCTURAL-STUDY OF THE SINUS VENOSUS IN EMBRYOS OF THE DOGFISH (SCYLIORHINUS-CANICULA)
Autore:
RAMOS C; MACIAS D;
Indirizzi:
INST PASTEUR,DEPT BIOL MOL,LAB GENET MOL MORPHOGENESE,25 RUE DR ROUX F-75724 PARIS 15 FRANCE UNIV MALAGA,FAC SCI,DEPT ANIM BIOL E-29071 MALAGA SPAIN
Titolo Testata:
Anatomy and embryology
fascicolo: 6, volume: 198, anno: 1998,
pagine: 523 - 536
SICI:
0340-2061(1998)198:6<523:UOTSVI>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
AMBYSTOMA-MEXICANUM; CARDIAC DEVELOPMENT; CHICK-EMBRYO; EPICARDIUM; HEART; ENDOCARDIUM; MYOCARDIUM; TELEOSTEI; AXOLOTL; ORIGIN;
Keywords:
ULTRASTRUCTURE; HEART DEVELOPMENT; GANGLION CELLS; NODAL TISSUE; FISH;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
51
Recensione:
Indirizzi per estratti:
Citazione:
C. Ramos e D. Macias, "ULTRASTRUCTURAL-STUDY OF THE SINUS VENOSUS IN EMBRYOS OF THE DOGFISH (SCYLIORHINUS-CANICULA)", Anatomy and embryology, 198(6), 1998, pp. 523-536

Abstract

An ultrastructural study of the development of the sinus venosus has been carried out on seven embryos of the dogfish (Scyliorhinus canicula L.) between 10.5 and 69 mm of total length (TL). The sinus venosus appears at the end of the looping process of the cardiac tube, namely in the 10.5 mm embryo, when the heart reaches its adult tetracameral S-form. The endocardium of the smallest embryo is constituted of a single layer of cubic cells. In larger embryo, these cells progressively acquire a squamous appearance as well as electron-dense cytoplasmic inclusions. The subendocardium is progressively populated by ganglion cells. Schwann cells and bundles of amyelinic fibers that can first be recognised in the embryo of 34 mm TL. Some subendocardial mesenchymal cells located in earlier embryos close to the entrance of the ducts of Cuvier might be their ectomesenchymal progenitors. The myocardium is initially constituted of a single layer of cubic cells. In the embryos of19, 27 and 34 mm TL, the myocardium becomes multilayered, and the myocardiocytes develop myofibrils randomly arranged throughout the sarcoplasm. In later embryos, the myocardiocytes are innervated and arrangedin oval bundles surrounded by a basal lamina. The epicardium covers the sinus venosus by the retrograde migration of the epithelium alreadyestablished around the atrioventricular groove and, in a lesser degree, by the adhesion of mesothelial cells that are floating free in the pericardial cavity. This process has finished in the embryo of 34 mm TL. The differentiation of the sinus venosus (including the endocardialand myocardial differentiation as well as the epicardial covering) progresses in an antero-ventral-posterodorsal direction.

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Documento generato il 06/04/20 alle ore 02:06:14