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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