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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: Pânã la aproximativ 2 sãptãmâni şi 1/2, epiblastul a format 3 ţesuturi specializate sau straturi de germeni, numite ectoderm, endoderm, şi mezoderm.

Ectodermul dã naştere la numeroase structuri, inclusiv creierului, mãduvei spinãrii, nervilor, pielii, unghiilor, şi pãrului.

Endodermul produce cãile sistemului respirator şi tractul digestiv şi genereazã porţiuni ale organelor principale cum ar fi ficatul şi pancreasul.

Mezodermul formeazã inima, rinichii, oasele, cartilagiile, muşchii, celulele sanguine şi alte structuri.

All ages referenced to fertilization, not last menstrual period.
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