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Mesoscopic and ultrastructural study on the atrio-auricular complex related to myoendocrine cells in guinea pig

Eliane Florencio Gama Cláudio Antonio Ferraz de Carvalho; Edson Aparecido Liberti; Romeu Rodrigues de Souza; Congress of the Brazilian Society for Cell Biology (12. 2004 Campinas); Ibero-American Congress of Cell Biology (9. 2004 Campinas)

Abstracts Campinas, SP

Campinas 2004

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  • Título:
    Mesoscopic and ultrastructural study on the atrio-auricular complex related to myoendocrine cells in guinea pig
  • Autor: Eliane Florencio Gama
  • Cláudio Antonio Ferraz de Carvalho; Edson Aparecido Liberti; Romeu Rodrigues de Souza; Congress of the Brazilian Society for Cell Biology (12. 2004 Campinas); Ibero-American Congress of Cell Biology (9. 2004 Campinas)
  • Assuntos: ANATOMIA
  • É parte de: Abstracts Campinas, SP
  • Notas Locais: Disponível em CD-ROM
  • Descrição: Previous studies in guinea pig hearts have shown the presence of specific atrial granules, which secrets an activator of sodium and water excretion and consenquently blood pressure reduction. This hormone, called atrial natriuretic factor (ANF), are secreted and released by the atrio-auricular complex under stimuli of hypervolemia or blood pressure increase. The endocardial surface plays a fundamental role in the transport and activation of ANF. The objective of this paper was to analyse the myoarchitecture, angioarchitecture, endocardial surface and ultrastructure of the guinea pig atrio-auricular complex, and their role in the ANF function. Hearts from 20 guinea pigs were used. The results showed that the muscle architecture in the auricles are more complex than in the atria. The arterial arrangement of the atria shows a vascular net relatively uniform and dense. In the auricle, the arterial net is denser and tortuous The scanning electron microscopy of endocardial surface has shown irregularities on the auricular surface, with the atrial surface showing a uniform arrangement. The findings related to the atrial-auricular complex are very useful, since it has been observed in studies related to cardiac surgeries that removal of the auricles, and consequently reduction of circulating ANF, causes acute and chronic abnormalities in the body fluid control
  • Editor: Campinas
  • Data de criação/publicação: 2004
  • Formato: [s. p.].
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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