Endoderm movements in the chick embryo between the early short streak and head process stages
✍ Scribed by Rosenquist, Glenn C.
- Book ID
- 102893380
- Publisher
- John Wiley and Sons
- Year
- 1972
- Tongue
- English
- Weight
- 615 KB
- Volume
- 180
- Category
- Article
- ISSN
- 0022-104X
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✦ Synopsis
Endoderm movements in the chick embryo between the early short streak and head process stages were studied by tracing the migration of tritiated thymidine-labeled grafts excised from explanted donor embryos and transplanted to identical positions in explanted recipient embryos of the same stage.
During the primitive streak stages, the endoderm layer migrates in a n orderly fashion away from a center of the primitive streak which is located about one fourth to one third of the distance from its anterior to its posterior end; all grafts placed in the endoderm anterior, lateral or posterior to this center migrated respectively anteriorly, laterally and posteriorly toward the outer margin of the area pellucida. During this migration, the grafts became narrowed and stretched out to conform with the rounded circumference of the area pellucida. Endoderm cells located i n the endoderm center itself never completely left the streak, but spread out i n all directions until they occupied a central circular area destined to form the gut.