Quicktime Development Animation - Endoderm
From Embryology
<wikiflv width="280" height="322" autostart="true" position="left">Endoderm 002.flv|File:Endoderm 002 icon.jpg</wikiflv>
This animation shows the early development of endoderm forming the gastrointestinal tract, yolk sac and allantois. The movie starts approximately week 3 and continues through week 4.
Links: Quicktime version | labeled version | large version | Gastrointestinal Tract Development