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Day 3: Say Cheese! A Microscope's View 
The head and upper body of the embryo has curved even more and the tail is beginning to curve as well. The ear is clearly visible.The two parts of the embryonic eye, the lens and the optic cup surrounding it, are also distinguishable. Different portions of the brain can be seen. There are about 30 somites at this stage. Because the heart grows so quickly at this stage, it cannot fit inside the embryo. The tight fit causes the heart to loop and twist as it grows. The rest of the body eventually turns to lay on its left side, giving the heart more room.
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How has today's photomicrograph of a 72 hour
chick embryo changed from yesterday's
photomicrograph of a 48 hour chick embryo?
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