FROM CLEAVAGE TO PRIMITIVE STREAK FORMATION - A COMPLEMENTARY NORMAL TABLE AND A NEW LOOK AT THE 1ST STAGES OF THE DEVELOPMENT OF THE CHICK .2. MICROSCOPIC ANATOMY AND CELL-POPULATION DYNAMICS
FROM CLEAVAGE TO PRIMITIVE STREAK FORMATION - A COMPLEMENTARY NORMAL TABLE AND A NEW LOOK AT THE 1ST STAGES OF THE DEVELOPMENT OF THE CHICK .2. MICROSCOPIC ANATOMY AND CELL-POPULATION DYNAMICS
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DOI：
10.1016/0012-1606(80)90117-7
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发表时间：
1980-01-01
影响因子：
2.7
通讯作者：
EYALGILADI, H
中科院分区：
文献类型：
--
作者：
KOCHAV, S;GINSBURG, M;EYALGILADI, H
描述了子宫和刚产下的未孵化和短暂孵化的雏鸡胚芽的显微解剖结构。特别关注三个发育时期之间的差异：卵裂、透明区形成和初级下胚层形成。在卵裂过程中，生发盘的细胞质分裂成卵裂球，卵裂球不断变小，并形成生发下腔。细菌正在积累大量的糖原储备，以供下一个时期使用。透明区域由极化细胞脱落过程产生。在此过程中，所有上皮下细胞聚集并落入胚盘下腔，在那里它们在未来的胚盘前侧下方聚集。细胞脱落过程可能是消耗能量的，并且随着细胞脱落的进行，糖原储备被利用，从胚芽的后侧开始并终止于胚芽的前侧。在此过程中，细菌损失了约 1/5 的初始细胞质质量。初级下胚层的形成是前后极化的。多内陷过程的开始与最后上皮下细胞的脱落同时发生。
The microscopic anatomy of uterine and freshly laid unincubated and briefly incubated chick germs is described. Special attention is paid to the difference between 3 developmental periods: cleavage, area pellucida formation and primary hypoblast formation. During cleavage the cytoplasm of the germinal disc divides into blastomeres, which become constantly smaller, and the subgerminal cavity is formed. The germ is accumulating extensive glycogen reserves for utilization during the next period. The area pellucida arises from a polarized cell-shedding process. During this process all the subepithelial cells round up and fall into the subblastodermic cavity, where they assemble beneath the future anterior side of the blastoderm. The cell-shedding process is presumably energy consuming and the glycogen reserves are utilized as cell shedding progresses, starting at the posterior and terminating at the anterior side of the germ. The germ loses about 1/5 of its initial cytoplasmic mass during this process. The formation of the primary hypoblast is polarized, posterioranteriorly. The onset of the process of polyinvagination takes place concomitantly with the shedding of the last subepithelial cells.