Details - Public Health Image Library(PHIL)

ID#:

10148

Caption:

Known as a quitter, this non-viable, fertilized egg was observed using what is known as 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, and no developing embryo, or any blood vessels. In the case of this quitter, note a thin blood ring encircling the yolk. Winners are eggs that are fertilized, and lead to the growth of a healthy embryo (PHIL 10149). In this case, one will observe blood vessels surrounding the yolk, and depending upon the length of gestation, one might see a dark shadow representing the developing embryonic eye.

High Resolution:

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Content Provider(s):

CDC/ Dr. Joseph McDade

Creation Date:

1978

Photo Credit:

Links:

Categories:

CDC Organization