Tubes digestifs d’embryons de poulet, caille, poisson zèbre et souris
The digestive tracts of chick E12 (from left), quail E12, zebra finch E13, and mouse E16,5 embryos are shown with the mesenteric tissue still attached. The top row shows the relative size of the eggs (or embryo, in the case of the mammal).
Composite photo courtesy of Natasza Kurpios
source : What’s behind the predictably loopy gut, Harvard Science 2011