Placentation in the Amazonian manatee (Trichechus inunguis)
Evidence from several sources supports a close phylogenetic relationship between elephants and sirenians. To explore whether this was reflected in similar placentation, we examined eight delivered placentae from the Amazonian manatee using light microscopy and immunohistochemistry. In addition, the...
| Autor principal: | Carter, Anthony M. |
|---|---|
| Outros Autores: | Miglino, Maria Angelica, Ambrósio, Carlos Eduardo, dos Santos, Tatiana Carlesco, Weber Rosas, Fernando Cesar, D'Affonsêca Neto, José Anselmo, Lazzarini, Stella Maris, Carvalho, Ana Flávia de, Silva, Vera Maria Ferreira da |
| Grau: | Artigo |
| Idioma: | English |
| Publicado em: |
Reproduction, Fertility and Development
2020
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| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/16342 |
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oai:repositorio:1-16342 |
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oai:repositorio:1-16342 Placentation in the Amazonian manatee (Trichechus inunguis) Carter, Anthony M. Miglino, Maria Angelica Ambrósio, Carlos Eduardo dos Santos, Tatiana Carlesco Weber Rosas, Fernando Cesar D'Affonsêca Neto, José Anselmo Lazzarini, Stella Maris Carvalho, Ana Flávia de Silva, Vera Maria Ferreira da Animals Cell Animals Tissue Blood Vessel Cell Ultrastructure Columnar Epithelium Controlled Study Cytotrophoblast Female Fetus Circulation Fetus Membrane Histopathology Immunohistochemistry Inner Ear Nonhuman Phylogeny Placental Delivery Reproduction Microscopy, Electron, Scanning Trichechus Inunguis Trophoblast Umbilical Cord Vascularization Afrotheria Elephantidae Sirenia Trichechus Inunguis Evidence from several sources supports a close phylogenetic relationship between elephants and sirenians. To explore whether this was reflected in similar placentation, we examined eight delivered placentae from the Amazonian manatee using light microscopy and immunohistochemistry. In addition, the fetal placental circulation was described by scanning electron microscopy of vessel casts. The manatee placenta was zonary and endotheliochorial, like that of the elephant. The interhaemal barrier comprised maternal endothelium, cytotrophoblasts and fetal endothelium. We found columnar trophoblast beneath the chorionic plate and lining lacunae in this region, but there was no trace in the term placenta of haemophagous activity. The gross anatomy of the cord and fetal membranes was consistent with previous descriptions and included a four-chambered allantoic sac, as also found in the elephant and other afrotherians. Connective tissue septae descended from the chorionic plate and carried blood vessels to the labyrinth, where they gave rise to a dense capillary network. This appeared to drain into shorter vessels near the chorionic plate. The maternal vasculature could not be examined in the same detail, but maternal capillaries ran rather straight and roughly parallel to the fetal ones. Overall, there is a close resemblance in placentation between the manatee and the elephant. © CSIRO 2008. 2020-06-03T21:27:31Z 2020-06-03T21:27:31Z 2008 Artigo https://repositorio.inpa.gov.br/handle/1/16342 10.1071/RD08009 en Volume 20, Número 4, Pags. 537-545 Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ application/pdf Reproduction, Fertility and Development |
| institution |
Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional |
| collection |
INPA-RI |
| language |
English |
| topic |
Animals Cell Animals Tissue Blood Vessel Cell Ultrastructure Columnar Epithelium Controlled Study Cytotrophoblast Female Fetus Circulation Fetus Membrane Histopathology Immunohistochemistry Inner Ear Nonhuman Phylogeny Placental Delivery Reproduction Microscopy, Electron, Scanning Trichechus Inunguis Trophoblast Umbilical Cord Vascularization Afrotheria Elephantidae Sirenia Trichechus Inunguis |
| spellingShingle |
Animals Cell Animals Tissue Blood Vessel Cell Ultrastructure Columnar Epithelium Controlled Study Cytotrophoblast Female Fetus Circulation Fetus Membrane Histopathology Immunohistochemistry Inner Ear Nonhuman Phylogeny Placental Delivery Reproduction Microscopy, Electron, Scanning Trichechus Inunguis Trophoblast Umbilical Cord Vascularization Afrotheria Elephantidae Sirenia Trichechus Inunguis Carter, Anthony M. Placentation in the Amazonian manatee (Trichechus inunguis) |
| topic_facet |
Animals Cell Animals Tissue Blood Vessel Cell Ultrastructure Columnar Epithelium Controlled Study Cytotrophoblast Female Fetus Circulation Fetus Membrane Histopathology Immunohistochemistry Inner Ear Nonhuman Phylogeny Placental Delivery Reproduction Microscopy, Electron, Scanning Trichechus Inunguis Trophoblast Umbilical Cord Vascularization Afrotheria Elephantidae Sirenia Trichechus Inunguis |
| description |
Evidence from several sources supports a close phylogenetic relationship between elephants and sirenians. To explore whether this was reflected in similar placentation, we examined eight delivered placentae from the Amazonian manatee using light microscopy and immunohistochemistry. In addition, the fetal placental circulation was described by scanning electron microscopy of vessel casts. The manatee placenta was zonary and endotheliochorial, like that of the elephant. The interhaemal barrier comprised maternal endothelium, cytotrophoblasts and fetal endothelium. We found columnar trophoblast beneath the chorionic plate and lining lacunae in this region, but there was no trace in the term placenta of haemophagous activity. The gross anatomy of the cord and fetal membranes was consistent with previous descriptions and included a four-chambered allantoic sac, as also found in the elephant and other afrotherians. Connective tissue septae descended from the chorionic plate and carried blood vessels to the labyrinth, where they gave rise to a dense capillary network. This appeared to drain into shorter vessels near the chorionic plate. The maternal vasculature could not be examined in the same detail, but maternal capillaries ran rather straight and roughly parallel to the fetal ones. Overall, there is a close resemblance in placentation between the manatee and the elephant. © CSIRO 2008. |
| format |
Artigo |
| author |
Carter, Anthony M. |
| author2 |
Miglino, Maria Angelica Ambrósio, Carlos Eduardo dos Santos, Tatiana Carlesco Weber Rosas, Fernando Cesar D'Affonsêca Neto, José Anselmo Lazzarini, Stella Maris Carvalho, Ana Flávia de Silva, Vera Maria Ferreira da |
| author2Str |
Miglino, Maria Angelica Ambrósio, Carlos Eduardo dos Santos, Tatiana Carlesco Weber Rosas, Fernando Cesar D'Affonsêca Neto, José Anselmo Lazzarini, Stella Maris Carvalho, Ana Flávia de Silva, Vera Maria Ferreira da |
| title |
Placentation in the Amazonian manatee (Trichechus inunguis) |
| title_short |
Placentation in the Amazonian manatee (Trichechus inunguis) |
| title_full |
Placentation in the Amazonian manatee (Trichechus inunguis) |
| title_fullStr |
Placentation in the Amazonian manatee (Trichechus inunguis) |
| title_full_unstemmed |
Placentation in the Amazonian manatee (Trichechus inunguis) |
| title_sort |
placentation in the amazonian manatee (trichechus inunguis) |
| publisher |
Reproduction, Fertility and Development |
| publishDate |
2020 |
| url |
https://repositorio.inpa.gov.br/handle/1/16342 |
| _version_ |
1787144118220095488 |
| score |
11.755432 |