File:CDC PHIL 10149 – fertilized egg, 11 days old.jpg

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	11:30, 11 January 2023	No thumbnail	1,206 × 1,789 (246 KB)	Opencooper	{{Information \|Description=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 obser...

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Candling

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Image title	1978Dr. Joseph McDadeThis image depicts the appearance of a healthy, 11-day-old fertilized 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 seen in PHIL 10147, 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. As was the case with this egg, “winners” are eggs that had been fertilized, and lead to the growth of a healthy embryo. 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.
Horizontal resolution	300 dpi
Vertical resolution	300 dpi
Image width	1,206 px
Image height	1,789 px
Software used	Adobe Photoshop CS2 Windows
Date and time of digitizing	05:48, 13 February 2008
File change date and time	03:44, 14 February 2008
Date metadata was last modified	03:44, 14 February 2008
Writer	P78-52
IIM version	2
JPEG file comment	1978 Dr. Joseph McDade This image depicts the appearance of a healthy, 11-day-old fertilized 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 seen in PHIL 10147, 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. As was the case with this egg, “winners” are eggs that had been fertilized, and lead to the growth of a healthy embryo. 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.