FROM CLEAVAGE TO PRIMITIVE STREAK FORMATION - COMPLEMENTARY NORMAL TABLE AND A NEW LOOK AT 1ST STAGES OF DEVELOPMENT OF CHICK .1. GENERAL MORPHOLOGY
FROM CLEAVAGE TO PRIMITIVE STREAK FORMATION - COMPLEMENTARY NORMAL TABLE AND A NEW LOOK AT 1ST STAGES OF DEVELOPMENT OF CHICK .1. GENERAL MORPHOLOGY
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DOI：
10.1016/0012-1606(76)90178-0
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发表时间：
1976-01-01
影响因子：
2.7
通讯作者：
KOCHAV, S
中科院分区：
文献类型：
--
作者：
EYALGILADI, H;KOCHAV, S
已经开发出一种人工方法，可以在不伤害母鸡的情况下从生殖道中取出鸡蛋。在汉堡和汉密尔顿的第二阶段之前的14个发育阶段已经从活体材料中进行了研究，并从上表面和下表面进行了拍摄。三个发展时期已被区分：卵裂，透明区的形成，和下胚层形成。后两个时期是形态发生时期，紧随着胚轴的确定。在卵裂过程中，胚芽的直径变小，细胞质团变厚。后来，细菌的面积逐渐增加。透明区的形成是下层卵黄细胞定向大量丢失的结果。初级下胚层的形成是后-前取向的多内陷和随后的细胞聚集体在同一方向上的聚结的结果。目前还不能断定是否也存在向前定向的细胞运动。不一致的使用术语胚盘和胚盘进行了讨论。作者建议避免术语胚盘，并使用通用术语胚芽的所有早期阶段。术语胚盘可以从阶段VI开始应用。
A manual method has been developed to extract eggs from the genital tract without harming the hen. Fourteen developmental stages preceding Hamburger and Hamilton's stage 2 have been studied from live material and photographed from both upper and lower surfaces. Three developmental periods have been distinguished: cleavage, formation of area pellucida, and hypoblast formation. The last two are morphogenetic periods which follow the determination of the embryonic axis. During cleavage the diameter of the germ becomes reduced and the cytoplasmic mass becomes thicker. Later there is a progressive increase of the germ's area. The formation of the area pellucida is a result of an oriented massive loss of the yolk laden cells of the lower layers. The formation of the primary hypoblast is a result of posterio-anteriorly oriented polyinvagination and a later coalescence of the cell aggregates in the same direction. It is not yet possible to conclude whether there is also an anteriorly directed cell movement. The inconsistent usage of the terms blastodisc and blastoderm is discussed. The authors suggest avoiding the term blastodisc and using the general term germ for all the early stages. The term blastoderm may be applied from stage VI onward.