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Master's Dissertation
DOI
10.11606/D.10.2007.tde-13022008-160147
Document
Author
Full name
Hugo Andrés Gutiérrez Trujillo
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2007
Supervisor
Committee
Mariana, Arani Nanci Bomfim (President)
Corrêa, Valeria Pires
Santos, José Manoel dos
Title in Portuguese
Formação e desenvolvimento dos membros de embriões e fetos bovinos
Keywords in Portuguese
Bovino
Calcificação óssea
Embrião
Ossificação endocondral
Abstract in Portuguese
O período embrionário apresenta maior susceptibilidade a teratógenos, sendo a fase que as primitivas camadas germinativas e rudimento dos órgãos são formados. Cada órgão tem uma fase crítica de desenvolvimento e os processos bioquímicos envolvidos no crescimento e diferenciação tem uma seqüência ordenada, controlada por vários genes. A ossificação endocondral tem inicio sobre um molde de cartilagem hialina, com formato semelhante ao osso que irá se originar, sendo o principal responsável pela formação dos ossos curtos e longos. Assim, julgamos ser de grande valia um estudo embasado no desenvolvimento normal dos membros de embriões e fetos bovinos provenientes de vacas criadas em ambiente natural, através de estudos em microscopia de luz e microscopia eletrônica de transmissão. No processo de formação, desenvolvimento e ossificação dos membros observamos a formação de tecido mesenquimal condensado em embriões por volta da quarta semana gestacional, passando pelo processo de diferenciação em células cartilaginosas. Ao redor da sétima semana gestacional inicia-se o processo de calcificação da cartilagem com depósitos de cálcio e fósforo para formação de tecido ósseo, seguido de morte dos condrócitos.
Title in English
Formation and development of limbs of bovine embryos and fetuses
Keywords in English
Bone calcification
Bovine
Embryo
Endochondrial ossification
Abstract in English
The embryonary period presents a bigger susceptibility to theratogens, being the phase in which the primitive germinative layers and rudiment of organs are been formed. Each organ has a critical phase of development and the biochemical processes involved in growing and differentiation have an ordered sequence, controlled by several genes. The endochondrial ossification has begun over a hyaline cartilage mould, having a shape similar to the bone that will be grow, being the principal responsible for the short and long bones formation. Thus, we think it is much valid a study based on normal development of bovine embryos and fetuses' limbs coming from cows bred in a natural environment, through studies in light microscopy and transmission electronic microscopy. In the process of formation, development and ossification of limbs, we saw condensed mesenchymal tissue formation in the embryos at around the gestational fourth week, passing through differentiation process in cartilaginous cells. At around the gestational seventh week, it has begun the calcification process of cartilage with calcium and phosphorous deposits to the bone tissue formation, followed by chondrocites death.
 
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Publishing Date
2008-03-06
 
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