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  • 1
    Electronic Resource
    Electronic Resource
    Changes in the endothelial morphology of the developing semilunar heart valves (1983)
    Springer
    Anatomy and embryology 167 (1983), S. 67-83 
    Details
    ISSN: 1432-0568
    Keywords: Endothelium ; Semilunar valves ; Hemodynamics ; Embryonic heart ; Heart morphogenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In view of recent evidence showing that shape and orientation of endothelial cells is determined by blood flow, the endothelium of the semilunar valves was studied in the developing chick heart using transmission and scanning electron microscopy. The results reveal significant developmental modifications of endothelial morphology and structure. These modifications can be linked to modifications of local blood flow and can also explain several aspects of valvular morphogenesis. The results substantially support the hypothesis of an involvement of hemodynamics in the development of the semilunar valves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00304601
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Malformations of the semilunar valves produced in chick embryos by mechanical interference with cardiogenesis (1983)
    Springer
    Anatomy and embryology 168 (1983), S. 59-71 
    Details
    ISSN: 1432-0568
    Keywords: Heart morphogenesis ; Semilunar valves ; Hemodynamics ; Embryonic heart
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The purpose of the present work was to analyze the role of hemodynamics in the morphogenesis and histogenesis of the semilunar valves. To achieve this goal we have studied the development of the chick semilunar valves in conditions of abnormal local flow. To obtain an abnormal pattern of local flow we have induced alterations of the cardiac septation process by mechanical interference of the development of the conus cordis. The malformations obtained by this procedure consisted of a spectrum of alterations in the process of incorporation of the aortic conus into the left ventricle. These malformations ranged from a simple widening of the outflow tract of the left ventricle to severe forms of double-outlet right ventricle and ventricular septal defects. Malformations of the semilunar valves consisting of extensive thickening of the leaflets and lack of maturation of the valve tissues were very often present in the malformed hearts. The malformation of the valve leaflets was more frequent and severe in the aortic valve at more advanced stages of development and in the hearts showing more severe alteration of the septation process. The absence of alterations in the semilunar valves of the control embryos and in the experimental embryos without alteration of the cardiac septation suggest a close relationship between the semilunar valves anomalies and the hemodynamic alterations present in the malformed hearts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00305399
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    Paper (German National Licenses)
    Fulltext
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