405433824-resumo-docx.docx - Nomes Origem embrionária No...

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Nomes: _________________________________________________________ _________________________________________________________ Origem embrionária No final da neurulação no embrião, a maioria dos precursores da pele está delineada. A camada única de ectoderme superficial prolifera, originando a epiderme de múltiplas camadas. A camada profunda da epiderme, o estrato basal (estrato germinativo) , fica sobre a membrana basal. Mediante divisão celular ativa, o estrato germinativo substitui a camada única de células denominada periderme . Outras camadas cutâneas são derivadas dessas duas à medida que a diferenciação prossegue. O tegumento é composto por duas camadas, epiderme e derme, separadas pela membrana basal. São acrescentadas vascularização e inervação, além das contribuições da crista neural, responsável pela armadura óssea do organismo. A partir de camadas, surge uma grande variedade de derivados tegumentares. A interação entre epiderme e derme estimula especializações como dentes, penas, pelos e escamas de diversas variedades.
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