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Early in the 4th week, the primitive gut is an endoderm-lined tube. The midgut is connected to the yolk sac which has been removed in this specimen. The foregut is connected to the midgut and extends cranially behind the heart. The hindgut extends caudally from the midgut. 

                     Species: Mouse 
                     Day Gestation: 8 
             Approx. Human Age: 22 days 
                                   View: Ventral 
                Foregut and Hindgut
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