Initial Development of Bovine Placentation (Bos indicus) from the Point of View of the Allantois and Amnion
العنوان: | Initial Development of Bovine Placentation (Bos indicus) from the Point of View of the Allantois and Amnion |
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المؤلفون: | A. C. Assis Neto, Maria Angélica Miglino, E. C. C. Santos, F. T. V. Pereira |
المصدر: | Anatomia, Histologia, Embryologia. 38:341-347 |
بيانات النشر: | Wiley, 2009. |
سنة النشر: | 2009 |
مصطلحات موضوعية: | Placenta, Embryonic Development, Biology, Andrology, chemistry.chemical_compound, Allantois, Pregnancy, medicine, Animals, Amnion, Paraformaldehyde, Fetus, General Veterinary, Embryogenesis, Placentation, Embryo, General Medicine, Anatomy, medicine.anatomical_structure, chemistry, Pregnancy, Animal, Cattle, Female |
الوصف: | The aim of this study was to perform a morphological characterization of the initial bovine placental development, between 20 and 70 days post-insemination (p.i.), with emphasis on the differentiation of the allantois and amnion. After collection, the conceptuses were dissected, macroscopically measured and photographically documented. The extraembryonic membranes were cut into fragments measuring 5 cm(2), and then fixed in 4% paraformaldehyde for analysis using light microscopy, and in 2.5% glutaraldehyde for use in scanning and transmission electron microscopy. The extraembryonic and fetal membranes presented variable degrees of development throughout the periods analysed. The macroscopic appearance of vascularization of the allantois, its attempt to merge with the chorium and the effective appearance of the first cotyledons in development were the events observed from 30 to 40 days of pregnancy. The measurements of the amnion increased gradually as gestation developed. The allantoic epithelia presented cellular dimorphism from 20 to 25 days of pregnancy, but was shown to be immature from 60 to 70 days of pregnancy. |
تدمد: | 1439-0264 0340-2096 |
URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9803e6f899d8554efda822eb8b34620d https://doi.org/10.1111/j.1439-0264.2009.00949.x |
حقوق: | CLOSED |
رقم الأكسشن: | edsair.doi.dedup.....9803e6f899d8554efda822eb8b34620d |
قاعدة البيانات: | OpenAIRE |
تدمد: | 14390264 03402096 |
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