Chorioallantoic and yolk sac placentation in the plains viscacha (Lagostomus maximus) - A caviomorph rodent with natural polyovulation

Objectives: Reproduction in the plains viscacha is characterized by the polyovulation of hundreds of oocytes, the loss of implantation and the development of 1-3 offspring. Our goal was to determine whether placental development was affected by these specializations. Study design: Thirteen placentas...

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Detalles Bibliográficos
Autores principales: Flamini, Mirta Alicia, Portiansky, Enrique Leo, Favaron, P. O., Martins, D. S., Ambrósio, C. E., Mess, A. M., Miglino, M. A., Barbeito, Claudio Gustavo
Formato: Articulo
Lenguaje:Inglés
Publicado: 2011
Materias:
Ciencias Veterinarias
Barrier
Placental development
Trophoblast invasion
Yolk sac
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/84493
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-84493
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Veterinarias
Barrier
Placental development
Trophoblast invasion
Yolk sac
spellingShingle Ciencias Veterinarias
Barrier
Placental development
Trophoblast invasion
Yolk sac
Flamini, Mirta Alicia
Portiansky, Enrique Leo
Favaron, P. O.
Martins, D. S.
Ambrósio, C. E.
Mess, A. M.
Miglino, M. A.
Barbeito, Claudio Gustavo
Chorioallantoic and yolk sac placentation in the plains viscacha (Lagostomus maximus) - A caviomorph rodent with natural polyovulation
topic_facet Ciencias Veterinarias
Barrier
Placental development
Trophoblast invasion
Yolk sac
description Objectives: Reproduction in the plains viscacha is characterized by the polyovulation of hundreds of oocytes, the loss of implantation and the development of 1-3 offspring. Our goal was to determine whether placental development was affected by these specializations. Study design: Thirteen placentas from early pregnancy to near-term pregnancy were analyzed using histological, immunohistochemical and transmission electron microscopy. Results: An inverted, villous yolk sac was present. Placentas were formed by the trophospongium, labyrinth and subplacenta. A lobulated structure with a hemomonochorial barrier was established early in pregnancy. Proliferating trophoblast that was clustered at the outer border and inside the labyrinth was responsible for placental growth. Trophoblast invasion resulted from the cellular trophoblast and syncytial streamers derived from the subplacenta. Different from other caviomorphs, numerous giant cells were observed. Conclusions: The principle processes of placentation in caviomorphs follow an extraordinarily stable pattern that is independent of specializations, such as polyovulation.
format Articulo
Articulo
author Flamini, Mirta Alicia
Portiansky, Enrique Leo
Favaron, P. O.
Martins, D. S.
Ambrósio, C. E.
Mess, A. M.
Miglino, M. A.
Barbeito, Claudio Gustavo
author_facet Flamini, Mirta Alicia
Portiansky, Enrique Leo
Favaron, P. O.
Martins, D. S.
Ambrósio, C. E.
Mess, A. M.
Miglino, M. A.
Barbeito, Claudio Gustavo
author_sort Flamini, Mirta Alicia
title Chorioallantoic and yolk sac placentation in the plains viscacha (Lagostomus maximus) - A caviomorph rodent with natural polyovulation
title_short Chorioallantoic and yolk sac placentation in the plains viscacha (Lagostomus maximus) - A caviomorph rodent with natural polyovulation
title_full Chorioallantoic and yolk sac placentation in the plains viscacha (Lagostomus maximus) - A caviomorph rodent with natural polyovulation
title_fullStr Chorioallantoic and yolk sac placentation in the plains viscacha (Lagostomus maximus) - A caviomorph rodent with natural polyovulation
title_full_unstemmed Chorioallantoic and yolk sac placentation in the plains viscacha (Lagostomus maximus) - A caviomorph rodent with natural polyovulation
title_sort chorioallantoic and yolk sac placentation in the plains viscacha (lagostomus maximus) - a caviomorph rodent with natural polyovulation
publishDate 2011
url http://sedici.unlp.edu.ar/handle/10915/84493
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