Carl's Roost:
Day 9 Observations
(Notes by Carl. Joanne is still cleaning up
after the tornado).
The 9-day chick is moving around a lot. We cannot
get very clear pictures, because it won't hold still
long enough! We can see the "motion artifacts" in
some images. We also see that if we repeat the same
slice over and over, it looks different each time.
Finally, we see lots of bright spots, especially in
the amnion, caused by "sloshing" of the fluid as the
chick moves. Note the difference between frame
frame 78 and 82 in this respect - the motion was
different, and the fluid looks different.
In Frame 45 and 78, we clearly see the blood-filled
membranes just inside the shell. These are used by
the chick to breathe (the shell is porous), the same
way we use our lungs. The membranes are bright because
the blood is flowing. Other blood vessels are
visible - only some of these are actually in the
chick's body.
The albumen continues to differentiate into two
layers, one above and one below the yolk. This is
particularly evident on frames 82 and 87, where the
different imaging techniques make the two layers
appear differently.
The yolk continues to deform, becoming flatter and
smaller.
C.D.Gregory: April 24, 1996