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The Endowment for Human Development
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Germ Layers and Organ Formation


14 days

From The Biology of Prenatal Development.Buy Now

Script: Aproximadamente depois de 2 semanas e meia, o epiblasto terá formado 3 tecidos especializados, ou camadas germinativas, chamadas ectoderma, endoderma, e mesoderma.

A ectoderma dá origem a numerosas estruturas, incluindo o cérebro, a coluna vertebral, os nervos, a pele, as unhas e o cabelo.

A endoderma produz o revestimento do sistema respiratório e do tubo digestivo e gera partes de órgãos importantes, como o fígado e o pâncreas.

A mesoderma forma o coração, os rins, os ossos, as cartilagens, os músculos, as células sangüíneas e outras estruturas.

All ages referenced to fertilization, not last menstrual period.
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