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Histomorphometry of pancreas development in hybrid chicken (Galus galus) embryo and fetus.
Microscopy Research and Technique 2018 June
The pancreas comprises an important metabolic organ of endocrine and exocrine character that has embryonic origin of rudimentary buds that fuse to form the organ. The present work aims to describe the pancreatic histogenesis of hybrid chick embryos (Gallus gallus). The research was performed in the UFPI, previously approved by the CEUA with protocol no. 040/15. We used 120 fertilized eggs of hybrid chickens kept in an incubator with controlled temperature and humidity. Daily collections of embryos and fetuses were performed from 4 to 21 days of incubation through the anatomical dissection consecutive the euthanasia. The tissues, previously fixed in 10% buffered formaldehyde, were submitted to histological processing and stained with hematoxylin-eosin. Finally, the mounted slides were analyzed in image software to obtain histomorphometric data, which were submitted to statistical analysis. The pancreas of hybrid chicken embryos originates around the fourth day of incubation with the dorsal and ventral pancreatic bud formation, which are composed by epithelial and mesenchymal cells. These cells differ in exocrine and endocrine cells. Around twelve embryonic days occurs the buds fusion and the immature organ formation that will give continue with the ductal system development, vascularization and compartmentalization of the endocrine and exocrine parts. Until 21st day of incubation it is possible to identify undifferentiated tissue forms which suggesting postnatal histogenesis. The description of pancreas histogenesis using histometric data on hybrid chicken embryos contributes to the clarification of embryonic development and reaffirms the premise that chickens serve as an experimental model for embryonic study of mammals.
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