 |
|
|
|
Year 2014 - Volume 34, Number 7
|
|
Development of the integumentary system in bovine with estimated gestational ages from 20 to 140 days, 34(7):695-702
|
ABSTRACT.- Tommasi Junior H.L., Favaron P.O., Rodrigues R.F., Guimarães P.G. & Miglino M.A. 2014. [Development of the integumentary system in bovine with estimated gestational ages from 20 to 140 days.] Desenvolvimento do sistema tegumentar em bovinos com idades gestacionais estimadas de 20 a 140 dias. Pesquisa Veterinária Brasileira 34(7):695-702. Departamento de Cirurgia, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, Av. Prof. Orlando Marques de Paiva 87, Cidade Universitária, São Paulo, SP 05508-900. Brazil. E-mail: miglino@usp.br
The skin is an important part of the integumentary system, which has important functions such as protection against dehydration, injury and infection, as well as present high potential of renewal. Histologically, the skin consists of two functional layers, that are morphologically distinct, the epidermis and dermis. The mammary glands, ungueal capsule and horn are also part of this system. Due the poor data available on literature about the development of skin and other cornea attachments in bovine, the aim of this study was to describe the morphological characteristics of the integumentary system development during the embryonic and fetal periods in bovine. Individuals were allocated in three groups: Group I - embryos from 20 to 26 days (n=4), Group II - embryos from 30 to 47 days (n=6) and Group III - fetuses from 74 to 140 days (n=6). During the development of the skin it was observed different morphological patterns according to the analyzed regions. Especially, a higher level of differentiation was observed during 30-47 days of gestation. The bovine claw and mammary gland develop later between 74 to 140 days of gestation. In summary, these results related to the development of the integumentary system in bovine may help the analysis and understanding of the development of their organs, as well as the pathological disorders associated to the
organogenesis. |
| |
|
|
| |
|
|
