title: Embryonic development of chicken (Gallus Gallus Domesticus) from 1st to 19th day-ectodermal structures.
abstract: Birds occupy a prominent place in the Brazilian economy not only in the poultry industry but also as an animal model in many areas of scientific research. Thus the aim of this study was to provide a description of macro and microscopic aspects of the ectoderm-derived structures in chicken embryos / fetuses poultry (Gallus gallus domesticus) from 1st to 19th day of incubation. 40 fertilized eggs, from a strain of domestic chickens, with an incubation period of 2-19 days were subjected to macroscopic description, biometrics, light, and scanning microscopy. All changes observed during the development were described. The nervous system, skin and appendages and organs related to vision and hearing began to be identified, both macro and microscopically, from the second day of incubation. The vesicles from the primitive central nervous system-forebrain, midbrain, and hindbrain-were identified on the third day of incubation. On the sixth day of incubation, there was a clear vascularization of the skin. The optic vesicle was first observed fourth day of development and on the fifth day there was the beginning of the lens formation. Although embryonic development is influenced by animal line as well as external factors such as incubation temperature, this paper provides a chronological description for chicken (Gallus gallus domesticus) during its embryonic development.
authors.affiliation: Department of Surgery, Faculty of Veterinary Medicine and Animal Science, University of São Paulo, São Paulo, Brazil.
authors.forename: Erika
authors.initials: E
authors.lastname: Toledo Fonseca
authors.forename: Fernanda Menezes
authors.initials: FM
authors.lastname: De Oliveira Silva
authors.forename: Dayane
authors.initials: D
authors.lastname: Alcântara
authors.forename: Rafael
authors.initials: R
authors.lastname: Carvalho Cardoso
authors.forename: André
authors.initials: A
authors.lastname: Luís Franciolli
authors.forename: Carlos Alberto Palmeira
authors.initials: CA
authors.lastname: Sarmento
authors.forename: Paula
authors.initials: P
authors.lastname: Fratini
authors.forename: Antônio
authors.initials: A
authors.lastname: José Piantino Ferreira
authors.forename: Maria Angélica
authors.initials: MA
authors.lastname: Miglino
mesh_terms: D000818:Animals; D002642:Chick Embryo; D002645:Chickens; D004423:Ear / Q000196:embryology; D004475:Ectoderm / Q000196:embryology*; D047108:Embryonic Development; D005123:Eye / Q000196:embryology; D008853:Microscopy; D008855:Microscopy, Electron, Scanning; D009420:Nervous System / Q000196:embryology; D012867:Skin / Q000196:embryology; D015053:Zygote / Q000254:growth & development*
keywords: chicken; ectoderm; embryology