germinal disk

noun

, Embryology.

1. blastodisk.

Word History and Origins

Origin of germinal disk¹

First recorded in 1875–80

Example Sentences

Segmentation is, as in other richly yolked eggs, incomplete, confined to the germinal disk at the opercular pole.

From Project Gutenberg

In this work, in the large folio form, beautiful representations are given of the author’s valuable observations on human embryology, and on that of various mammals, birds and fishes, and of the author’s 327 discovery in 1847 of the process of partial yolk segmentation in the germinal disk of the fowl’s egg during its descent through the oviduct, and his observations on the same phenomenon in fishes and mammals.

From Project Gutenberg

Germinal disk. layers, the. scheme of the. spot, the. vesicle, the.

From Project Gutenberg

These "eating yelk-cells" are found in large numbers in the food-yelk of the Selachii, especially in the yelk-wall—the border zone of the germinal disk in which the embryonic vascular net is first developed.

From Project Gutenberg

But this small white "germinal disk" is now further developed, and is really the gastrula of the chick.

From Project Gutenberg