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10147

PHIL Image 10147

ID#:10147
Description:This image depicts the appearance of a non-fertile egg when observed using what is known as a “candling” procedure. A very bright light is either placed behind the egg, such as was done throughout history by using a candle, hence the name, or employing more modern methods, using a powerful lamp placed against the broad end of the egg. In this way, the contents of the egg are revealed through the translucent shell.

If the egg is unfertilized, as was the case here, the observer will see only a round yolk sac, and no developing embryo, or any network of blood vessels. Unfertilized eggs are known as “yolkers”. Eggs known as “quitters”, had been fertilized, but the embryo had stopped growing. In the case of quitters, one will note a thin blood ring encircling the yolk, as seen in PHIL 10148. “Winners” are eggs that had been fertilized, and lead to the growth of a healthy embryo, which is seen in PHIL 10149. In this case, one will observe 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.

High Resolution:Right click here and select "Save Target As..." for hi-resolution image (6.52 MB)
Content Providers(s):CDC/ Dr. Joseph McDade
Creation Date:1978
Photo Credit:
Links:
Categories:
CDC Organization

MeSH
tree picture Organisms
tree picture tree picture Animals
tree picturetree picture tree picture Chordata
tree picturetree picturetree picture tree picture Vertebrates
tree picturetree picturetree picturetree picture tree picture Birds
tree picturetree picturetree picturetree picturetree picture tree picture Poultry
tree picturetree picturetree picturetree picturetree picturetree picture tree picture Chickens
Copyright Restrictions:None - This image is in the public domain and thus free of any copyright restrictions. As a matter of courtesy we request that the content provider be credited and notified in any public or private usage of this image.
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This page last reviewed: Mar. 18 2005
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