Transcript Normal Chicken Embryo Development

Normal Chicken Embryo
Development
By
Akrum Hamdy
Extra embryonic Membranes
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Protect and nourish the embryo
Terrestrial vertebrates have four extra
embryonic membranes
1.
2.
3.
4.
chorion
amnion
allantois
yolk sac
1. The chorion and amnion enclose the embryo
–
The chorion surrounds the entire embryo
•
–
in birds and reptiles it functions in gas exchange
The amnion encloses the embryo and forms an
open volume between the embryo & the amnion
called the amniotic cavity
•
The amniotic cavity fills with amniotic fluid, which envelops
the embryo and cushions it
2. The allantois is an outgrowth of the gut
•
In reptiles and birds, it stores nitrogenous wastes
3. The yolk sac encloses the yolk in vertebrates
with yolk-rich eggs
–
In humans, there is no yolk sac, but the yolk aids in
formation of red blood cells
Extra embryonic
Membranes
Primitive streak & groove
Credit: © Carolina Biological/Visuals Unlimited
Chicken embryo, 21 hours.
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heart
somites
Spinal chord
amnion
Credit: © Carolina Biological/Visuals Unlimited
Chicken embryo, 43 hours.
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eye
allantois
h
e
a
r
t
amnion
Spinal chord somites
Credit: © Carolina Biological/Visuals Unlimited
Chicken embryo, 60 hours.
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Credit: © Carolina Biological/Visuals Unlimited
Chicken embryo, 8 days.
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Credit: © Carolina Biological/Visuals Unlimited
Chick embryo, 9 days.
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Effect of aspirin in
chick embryo development
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Each group will set up three containers
– Each container has one chick embryo, 2
additional albumens
1. Negative control
2. Negative control (Ringers solution)
3. Experimental (aspirin in ringers solution)
Effect of aspirin in
chick embryo development
– Keep everything as sterile as possible!!
– Make observations daily (except
weekends)
– Share observations with other members of
your group
– Make drawing and written descriptions of
your observations.
Credit: © Carolina Biological/Visuals Unlimited
Chick embryo, 13 days.
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Credit: © Carolina Biological/Visuals Unlimited
Chick embryo, 16 days.
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Credit: © Carolina Biological/Visuals Unlimited
Chick embryo, 19 days.
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Credit: © Jerome Wexler/Visuals Unlimited
Newly hatched chick on day 21.
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