CONTENTS | Development of the ChickLike fish eggs, chick eggs are telolecithal and undergo meroblastic cleavage.Chick development has traditionally been presented in embryology and developmentalbiology courses because of the accessibility of embryos at desired stages. As well, it is a good model for understanding vertebrate development ingeneral and mammalian development in particular. Remember, you are not justlooking at the embryos; you are studying them to understand how the embryois formed. 24-hour ChickYou should studythe embryo by examining the material prepared by Dr. Steven Scaddingat The University of Guelph at his Web site, Developmental Biology ONLINE. This link will take you to the introduction homepage of the 24-hour chickembryo. It is crucial that you read and understand the explanationgiven on how to navigate through the 15 photographs of the chick embryo. After you have carefully read this, click on the 'GO! To the site'button. Movie: Ch_24hr.Mov. Next, you should use this movieto obtain an overview of the 24-hour chick embryo and to obtain a senseof the structural continuity of the embryo. This film was compiled fromphotographing serial cross-sections of the embryo. 48-hour ChickUse the same procedure as for the 24-hour stage. A detailedanalysis of the 48-hour chick has been prepared by Dr. Scadding. Again,the homepage for the 48-hour chick must be thoroughly understood beforeproceeding. Hint: The cranial flexure of the embryo makes the head of thechick point caudally, so that the most anterior section is the midbrain. The dextral torsion refers to the twisting of the embryo whereby the leftside of the anterior half rests upon the yolk, and the posterior half remainsdorsal-ventral with respect to the yolk. There are 45 sections to view. You will not have enough time to analyzethem in depth and identify every structure. Be sure that you can identifythe following:
Ik multimedia t-racks review. Movie: Ch_48hr2.Mov. Now examine the movie of the48-hour chick embryo cross-sections and try to identify the above structuresin the various sections. |
Dynamic Developmentat a Glance |
48hr chicken embryo viewed with 2X objective (anterior). 72hr chicken embryo serial cross-section viewed with 1X objective.
Dynamic Development is a Virtual Embryo learning resource.
| This material may be reproduced for educational purposes only providedcredit is given to the original source. Leon Browder& Laurie Iten(Ed.) Dynamic Development Last revised Wednesday, July 29, 1998 |
48 Hour Chick Embryo Whole Mount
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