Day7: Jumpin' Genes!

An MRI's View

This cross-sectional plane of this MRI passes through the base of the brain, the bottom of the eyes and through the beak. The allantois can now be seen lying next to the surface of the eggshell. At day four, the allantois is still just a small balloon-like sac extending from the hindgut. As the allantois grows, it comes to lie on top of the embryo. By day seven, the allantois has begun to fuse with the inner layer of the chorion.

The bright white spots in this image are cross-sections of blood vessels. Blood vessels appear white on an MRI because of the motion artifact caused by the blood flowing through them.

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