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The Embryology of the Interatrial Septum

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Fetal and Hybrid Procedures in Congenital Heart Diseases

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Abstract

Knowledge of the embryological development of the interatrial septum can provide the basis for understanding the morphogenesis of some congenital cardiac malformations. The interatrial septum consists of several embryological components including the septum primum, the anterosuperior and the posteroinferior cushions of the atrioventricular canal, the septum secundum, the left sinus valve, and the “spina vestibuli.” Atrial septation starts with the formation of the septum primum and the space between the free edge of the septum primum, and the atrioventricular cushion is the ostium primum. Before the closure of the ostium primum, multiple perforations appear in the septum primum, and their coalescence forms the ostium secundum. The septum secundum grows to the right of the septum primum. The complex of the lower rim of the septum secundum and the ostium secundum is called foramen ovale. During the fetal period because of the higher pressure in the right atrium, the blood passes from the right to the left atrium. After birth, when lung circulation begins its function, the pressure in the left atrium rises, and the foramen ovale is closed by the septum primum.

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Authors and Affiliations

  1. Department of Pediatrics, “Sapienza” – University of Rome, Rome, Italy

    Paolo Versacci, Walter Vignaroli, Gioia Mastromoro, Flavia Ventriglia & Bruno Marino

Authors
  1. Paolo Versacci
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  2. Walter Vignaroli
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  3. Gioia Mastromoro
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  4. Flavia Ventriglia
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  5. Bruno Marino
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Correspondence to Bruno Marino .

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Editors and Affiliations

  1. IRCCS Policlinico San Donato, San Donato Milanese, Italy

    Gianfranco Butera

  2. Pediatric Cardiology, Nationwide Children's Hospital, Columbus, Ohio, USA

    John Cheatham

  3. Instituto Dante Pazzanese de Cardiologia and Hospital do Coração, São Paulo, SP, Brazil, Sao Paulo, Brazil

    Carlos AC Pedra

  4. Giessen Hospital, Giessen, Hessen, Germany

    Dietmar Schranz

  5. Linz University, Linz, Austria

    Gerald Tulzer

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Versacci, P., Vignaroli, W., Mastromoro, G., Ventriglia, F., Marino, B. (2016). The Embryology of the Interatrial Septum. In: Butera, G., Cheatham, J., Pedra, C., Schranz, D., Tulzer, G. (eds) Fetal and Hybrid Procedures in Congenital Heart Diseases. Springer, Cham. https://doi.org/10.1007/978-3-319-40088-4_16

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  • DOI: https://doi.org/10.1007/978-3-319-40088-4_16

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  • Print ISBN: 978-3-319-40086-0

  • Online ISBN: 978-3-319-40088-4

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