Referred to as a winner, this healthy, 11-day-old fertilized egg was observed using a candling procedure, whereupon, a very bright light is placed behind the egg, as was done throughout history by using a candle, hence the name. Today, employing more modern methods, a powerful lamp is placed against the broad end of the egg. In this way, the contents of the egg are revealed through the translucent shell. In unfertilized eggs (PHIL 10147), known as yolkers, the observer will see only a round yolk sac, no developing embryo, and no blood vessels. In the case of quitters (PHIL 10148), which are fertilized eggs that have stopped growing, you will note a thin blood ring encircling the yolk. This winner revealed numbers of networked blood vessels surrounding the yolk, and depending upon the length of gestation, one might see a dark shadow representing the developing embryonic eye.
<ul><li>Content Provider(s): CDC / Dr. Joseph McDade</li></ul>
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